According to Adobe's official blog, over 50 tablet models will ship this year with Adobe Flash support. As for the Xoom,
Adobe will offer Flash Player 10.2 pre-installed on some tablets and as an OTA download on others within a few weeks of Android 3 (Honeycomb) devices becoming available, the first of which is expected to be the Motorola Xoom.
Sure, it's annoying that such a useful and almost necessary feature won't be available immediately. But if Adobe keeps its promise about a wait time of only a few weeks, then I think we can all be patient.