without Adobe Flash Player preloaded, the Motorola Xoom also has the ignoble distinction of having a non-functioning MicroSD card slot. We're assured by the company's reps that the update to make storage expansion work is imminent, but if you have to have it right this very minute, there's now a kernel for you. It goes by the name of Tiamat, originating on xda-developers (as most good things do), and has recently stepped up to support MicroSD card storage. You'll find download links and instructions for Tiamat at the source link, plus a few happy reports of it working as advertised.
[Thanks to everyone who sent this in]