Someone posted a link to a good deal on the Think Outside Ultra Slim a few weeks ago:
http://www.amazon.com/Stowaway-Ultra...6975212&sr=8-1
I picked one up and I have to say that I like it. I use it primarily with my Samsung Q1U so I can't comment on it specifically for use with a phone, but I imagine it would be pretty much the same. It locks into place so you can use it on your lap if you need to. The keys are large and well spaced (touch typing at regular speed is not a problem). I also haven't noticed it dropping any characters; it "feels" like I'm typing on a regular wired keyboard. It is quite small when folded in half for easy carrying. And for $30 with free shipping it's definetly worth it if you need to do some word processing/note taking/whatever. The only downside is that it is a 4 row keyboard, so it doesn't have dedicated number keys along the top (you have to hold a function button and then press the top row of keys). Not too big a deal for me though. You can get the slightly larger and nicer Think Outside for around $60 which has dedicated number keys. I needed to be able to use mine in my lap though, and I don't think that one locks in place.