Mike, this is definitely true. You have to start somewhere, and we chose iPhone. You'll find Treehouse on every platform eventually, and we hope to see you there :)
Please make "eventually" mean "really soon" in the case of Android. I know it's a big time sink to develop for another platform, but I found the Android API pretty straightforward to program for. I'm really into the concept behind this app, and would love to get my friends and colleagues on board, but about half of us use Android handsets. (nb: I work for Google.)
