The wait is over, guys - PopCap's hands down best game, Plants Vs Zombies, finally reached Android minutes ago after many months of anticipation. Normally $2.99, PvZ is available for free exclusively on the Amazon Android Appstore.
The game is a little on the heavy side - be prepared to dedicate 75MB of free space to it (though at least in CyanogenMod, all but 232KB can be moved to SD without any problems).
After a period of exclusivity, PopCap will upload it to the Android Market for everyone to use - until then, it's just us, U.S. folks. Sorry, rest of the world :( (unless you use the tricks posted in the comments that is ;)).