Before our last road trip I only had a few games for my son on my iPhone, but in an effort to keep him entertained in the car for 7 hours I loaded up before we hit the highway. I was in a rush and, against my nature, didn't do any research. On my own I picked some gems and some clunkers. Since then, I've gotten some great guidance from app review websites; here are my favorites:
Here are the sites I've found to be the best (in random order). They cast nets into the sea of apps for kids, throw back the small ones and highlight the best. If you have a great review site to add, leave a link in the comments; I'm all ears.
The iPhone Mom: Even though "iPhone" is in her name, this mom also reviews iPad apps. Each app gets a write-up from her perspective and often with input from her kids, a few screenshots, the price, a link to the app in iTunes and a link to the app developer (more useful than you'd think and a great way to discover other quality apps if you like one they've made). The site is easy to navigate and reviews are grouped by age. I like her Tips & Tricks section (like How to Turn Off Apps if you didn't know you were supposed to do that). My only quibble with this site is that whether an app is for iPhone/iPad/both or other smart phones is not clearly noted.
Common Sense Media: I've used this site many times in the past for reviews of kids movies, music, books and more but they also review apps. I like that reviews can be filtered by age and device so I don't get excited about an app that isn't available for my phone. They use an overall 5 star rating system and separately rate educational value and ease of use (as well as consumerism, violence, language and more). The reviews do include a few screen shots, but are not as robust as other sites and are usually a pretty straightforward description of the app's concept.
Apps4Kids: This site has been around for a few years which makes it one of the first as far as apps are concerned and is run by a mom and dad. Their reviews are short (maybe shorter than you'd like) but they have a good eye for quality. Each review has a description from the app developer and a "Why We Like It" statement. The 10 categories under Education are helpful for zeroing in on apps of interest to your kid.
Kirkus Reviews: Kirkus has been a trusted reviewer of books since 1933 and I'm happy to see they're keeping up with the times and reviewing book apps for the iPad. As with print books, they have high standards and their reviews are in-depth and include multiple screenshots and a video. They don't shy away from calling out bad apps like their scathing review of The Smurf's Movie Storybook.
Cool Mom Tech: The tech offshoot of Cool Mom Picks, the site is not dedicated to apps, but they definitely cover their favorites both for moms and kids like their recent write-up of developer Toca Boca (also my favorite app developer). You'll have to scroll a bit through their app category to find what you're looking for, but you can bet it will be good when you find it. (Plus, there are so many interesting tech posts to read you'll almost forget why you were there in the first place).
(One to watch is Lunch Box Reviews which is still in Beta, but looks promising. They're integrating user reviews (pulled from iTunes), critic reviews (approved bloggers) and descriptions from the developer. Besides organizing this information into an easy-to-use-site, I'm interested to see what value of their own they add. Stay tuned.)

Z2 iPod Dock and Wi...
What do you think is an appropriate age to start allowing a child to use an iphone/touch/pad? I have always heard that children should be kept from televisions until age two, but I'm not sure exactly why.
My personal belief is that TV is so passive and non-interactive that it is best avoided by little developing brains. It is also difficult to control the content - there are ads on broadcast TV and subtle messages in DVDs that I don't always agree with. Plus there is a tendency to overuse it as a babysitter because it is so mesmerizing and positive interactions between kids and adults are diminished.
I give the iPad/phone/touch a little bit of a pass because they are interactive (games, not the movie-watching capability). So we let our little guy use the iPad in moderation, maybe a total of 20 minutes or so a day and we have since he was about 1.5 years old. He actually doesn't ask for more time on it, though, as he has plenty of other stuff to do like help me vacuum and hunt for bugs outside.
i don't know about review sites, but my favorite kid apps right now are:
ed emberly's shake & make
sylvester's band
charley harper's peekaboo forest
monster coloring book
loopy tunes
A great site for ipad reviews of kids book apps is http://digital-storytime.com - over 250 reviews & a great 'deal' page w/lots of handpicked free kids apps.
Agreed with Marchold about http://www.digital-storytime.com run by Carisa who's an awesome book reviewer.
ReviewForDev also prepared a list sorted according to Alexa Ranking (daily update): http://www.reviewfordev.com/list-of-review-sites-to-find-the-best-educational-apps-for-kids.php
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I really like http://www.smartappsforkids.com. It has the most in depth reviews and the best giveaways. Most review sites only post positive stuff but this site is honest and very reliable. I love the Top 10 lists and Good Free App of the Day posts.
And especially when iPod is not just a MP3 player but also a web browsing device. I think above 7 is a good age to give them iPod Touch, of course only after you have discussed safe online behaviour. I was browsing this website for an app's review and came across this question. Shameless plugin, but we had a similar question on our site few days ago and we got some great answers by parents: http://quib.ly/qu/how-old-will-you-let-your-child-get-an-ipod
Also, check this one out http://www.appyreviews.com/category/best-kids-apps/