Among the list of apps for the 10 cent app promotion is Swiftkey X. I've used this keyboard for quite awhile now and absolutely love it. It's word prediction is top notch, and it's auto correction ain't too shabby either. If you don't already have it, I highly recommend adding it to your App portfolio. At 10 cents it's a total steal, and if you never use it .. well ... it's 10 cents!
I love the free app of the day on Amazon as much as the next guy, but the slow updates do frustrate me. The Android Market has been telling me an update is available for "Cut the Rope" for a couple weeks now, yet nothing on the Amazon market.
Also, yeah it looks like it'll be 10 apps per day over 10 days, for a total of 100 apps. Although an article I read made it sound like each day of apps will be available at 10 cents for the entire 10 days. I guess we'll find out tomorrow.