Hi,
from this article, it seems that a generic method to obtain root access on ICS android devices have been found.
http://www.modaco.com/page/news/_/android/a-new-and-effective-root-method-for-ics-jb-r715?utm_source...
I tried, it and it did not work out of the box, But there is some hope that the exploit could be adapted for our Excite tablets.
Franck