I've used a number of different wireless keyboards and keyboard cases. There are quite a few good ones around. Apple's own one is pricy but very good. There are good combo keyboard cases from ZAGG and Case-mate and others.
As for Google Docs, Yes - any of these keyboards will be usable in any app where you can enter text via the standard on-screen keyboard.
i bought one off ebay that i use that i use and it is similar to the zagg but a lot cheaper, the keys are not the same design as the zagg but i have had no problems with it at all, took a little while to get used to typing on it but once i did get used to it i have loved using it ever since, plus it protects the screen of my my iPad when not in use.
Iused to have one of those cheep knock off aluminium keyboards and it was great for the price but as besweet mentioned after a few seconds they keyboard would going into sleep mode and you would have to press any key and wait for it to come back on, very annoying when you are working on something to have this happen. I decided to buy a Zagg Folio Case with Bluetootrh Keyboard and i love it, mine is carbon fibre effect, i also put a carbon effect skin on my iPad as i ted it in my lorry as a Sat Nav with a screen holder. It all works great!
I just got my Logitech keyboard today. I've been using it for about half an hour and typing on it almost as productively as I do on a full size......almost. I'ts for the mini, so very small. I recommend it for women or men with small fingers.
I have the Kensington Folio Pro 2. I really like it because the keys aren't in some crazy layout. I have had other keyboards where the layout was weird which made it difficult to type. Plus I like having a removable keyboard so I can adjust the screen angle.
Sent from the baddest device on the planet. My smokin hot iPhone 5.
I just received a Clamcase for my iPad Air, and have not given it a real tryout yet. I like the way it fits, and keyboard feels good. The only color available was white, and honestly I think silver grey would have looked best. I do have a white iPad so it looks good, but I am thinking something darker would be more masculine
I found one problem, the Apple 2m charge cable is a little too large to fit the opening in the Clamcase. I remedied the problem with a few minutes and a very fine needle file, enlarging the opening.