Well, no, there isn't really much of a tablet market. It's an emerging market; a year ago it didn't even exist until the iPad single-handedly created it. Everybody else is still trying to catch up. Right now your choices are basically, an iPad, or something else that probably isn't nowhere near as good (unless you count Kindles and Nooks which are much more specialized devices).

However, in a few years or so, I can totally see casual users ditching their (in their eyes) complicated PCs and netbooks in favor of a tablet of some kind, as long as it does what they want (watch a video, send email, go on Facebook, listen to music, play a game, etc).