iOS 5 looks awesome. Users are not only going to get some of the features they've been clamoring for, but also some options they didn't even know they yet wanted. If you're like us, then just hearing about the features like iCloud and automatic backup can be annoying, because we want them NOW. If this is the case then you have two choices: 1. Become a developer and download the beta; or 2. check out these 3rd party apps...
One of the most highly touted features of iOS 5 is iCloud. As a quick refresher, iCloud essentially keeps all of your contacts, photos, and any other data backed up and synced between all of your devices. If this just seems so amazing that you can't wait for Apple, then check out SugarSync. Much like iCloud, SugarSync keeps all of your phones, tablets, and computers on the same page with all of your information, but unlike iCloud it does so for a small fee.
If you happen to be looking for a cheaper alternative, and also happen to be an avid Google user, then try syncing your iPhone to your Google Account through the Exchange account settings available in iOS 4. From here you will be able to set up push email, calendar and contacts. Included will be the option to automatically backup all your info just in case something were to happen to you iDevice.
Another big improvement in iOS 5 is tabbed browsing. A simple feature that has been enjoyed by many on their desktops is now finally coming natively to iOS. If this is something you just can't wait for, then check out one of the many 3rd party apps which brings this feature today. Some of our favorite tabbed browsing apps include Sleipner and Atomic Web Browser, both offering tabs.
While there are many other great features of iOS that we want today, an off the shelf iOS device won't cut it. Instead you have to venture outside of Apple's walled garden into the Cydia app store (aka jailbroken devices). Apps in this unsanctioned app store include Wi-Fi Sync - which again is much like iCloud - and MobileNotifier. While these apps don't have the full support of Apple, they'll allow additional iOS 5-like features without the need to wait for their official incorporation into OS.