Moving into our new office building, we spied a super cool feature in an upstairs office of a bunch of designers. On one wall they were using small metal magnets to hang all of their design drawings. Without piercing the drywall or needing to put up corkboard, they had simply painted the wall with magnetic paint which was extremely strong.
We went to Janovic to find it and they grumbled about it being discontinued, but when we spoke to the designers, they sent us this link. It's a good resource. Paint it on the wall as a primer - the more coats the stronger the magnetism - and then paint over with the color you desire. Available starting at $25 from Kling Magnetics in Chatham, New York. (Thanks, Travis!)

Nomade Express Slee...
Very interesting, I had been looking into a way to place things on walls, without having to hang a bulletin board or anything similar.
I wonder if there is a coating you could use after that would allow you to write with markers, with easy removal (think white-board).
If you use wifi, though, keep in mind that this will most likely play hell with your signal in this room.
I have used this. It worked really well. We primed my 6 year old nephews folding closet doors and then painted large grass blades over it. (His room is insect themed) We cut him out large ants from magnetic paper and he can position them on his closet.
It is no more than Grey primer with iron filing in it.
MUST HAVE NOW!!!!!
i used a similar product on the border of a bookcase, and the bottoms and edge of the shelves, for my kids room. i am making them magnets that they can move around to decorate/play themselves. (possibly using the charachters from all those paper book sleeves)
i figure then there is a more timeless quality to the bookcase itself - i can switch to more 'sophisticated' magnets as they get older.
Krylon makes a magnetic paint that is pretty readily available (at least anywhere you can get spray paint - here in Chicago it's banned, but you can get it in the burbs.) It's as great (and combinable with) the several types of chalkboard paint out there right now. I made a magnetic chalkboard on plain drywall mounted in an ornate picture frame and I love it!
Or make your wall into a magnet and a chalkboard with magnetic-chalkboard paint from Yoyamart!
http://www.yoyashop.com/ys_product.asp?cat_id=41&prd_id=97
I have a web site at www.lyt.com that sells a magnetic paint additive, a harmless dry powder that mixes easily with ordinary paint to make a super strong magnetic paint. It mixes easily, fresh each time you use it, no sitting around in closets and car trunks waiting to explode. It's child and pet safe, no dangerous chemicals and it can't harm anything in your computer. Magnetic paint does not have any actual magnetic energy of it's own and does not attract steel objects. Like a steel surface, magnetic paint only attracts magnets. My Magically Magnetic Paint is safe. I can't attest to the safety of the premixed explosive liquid magnetic paints on the market. The only danger conected to my additive is if you would drop it on your foot. It's heavy. We put eight pounds of magnetically attractive material in every gallon of ordinary paint.
Thank you for the opportunity to tell you about my product.
As spammy as Mr. Lytle's post sounds, I have to say I've used his product and it is fantastic.
is it true that this will mess with your wi-fi? will it cause any other problems with electrical wires in the walls?
Wait... why is it banned??
Is it toxic?
I'm also interested to know why it's banned. Is it toxic? Is there lead in it? If my cat licks the magnetic wall, will she die?
I have never heard of magnetic paint being banned anywhere. If your cat would lick a wall painted with my Magically Magnetic Paint, nothing at all would happen, to the cat or the wall. My magnetic paint is not toxic. In fact, you could eat my additive and nothing would happen. I don't know why you would want to eat it, but you could. Mix it with paint and all bets are off. I don't eat paint of any kind. One last point. Magically Magnetic Paint will not affect your wiring in your walls or do anything to your computer. It's as safe as my grandmother.
It looks like spray paint may be banned in Chicago, not magnetic paint specifically, if you re-read the original post. I just used some magnetic primer under chalkboard paint (I believe it is Rustoleum brand, which is what was available at my local big-box store), and I wouldn't call the attration super strong, or even strong. I used the reccomended 3 coats with a foam roller and would have used more except that the panels I was painting will have to slide back into the notches the slid out of and I don't want to add too much bulk in paint. Magnets will stick to the panels but I don't know that they would actually hold up a piece of paper; even the strong neodyoneum (sp?) magnets don't stick all that well. This will probably be fine for my application but I suggest MANY coats for real magnetic appeal. I also suggest KJ Magnetics (kjmagnetics.com)for the best magnets, they are great! Probably not great for kids though (too tiny- swallow hazard!). I'm not sure about Mr. Lytle's assertion that his rodut is "as safe as my grandmother" (perhaps she's a bit senile?) but it doesn't seem as though there is any extra toxicity to magnetic paint that isn't inherent to pain in general. I did see a post somewere that a whole wall painted with magnetic paint might block a wifi signal- I have zero personal experience with this but it seems plausible enough, I suppose if you wanted to paint a whole wall with the paint that would be between your wifi source and your wireless device, you might want to do a little research. Essentially, what you would be doing is creating a very thin wall of iron, so if a wall of iron blocks a wifi signal than maybe this paint would too.