The UDIG 0.9.1 release is now available:
http://udig.refractions.net/downloads/udig0.9.1.exe
More details (and manual install) here:
http://docs.codehaus.org/display/UDIG/UDIG+0.9
This release is much better then 0.9.0 with a focus on connecting to external services and searching.
Thanks,
Jody Garnett