Yep: they have been on constantly since the release. And Motorola just announced a 32GB WiFi Xoom for $599 to be released "later this month."
The battle just heated-up.
jdg
Heated up? Not likely. The XOOM will sell a few more now that there is a better entry model, but there is no way that its going to be "real" competition for the iPad 2. What will be important is getting more XOOMs into developers and "testers" hands so that development for Honeycomb (and future Android tablet OSes) can get going.