As others have posted, most Skyscape titles work fine in WM5. There were some problems early on, but they've worked to address these. I'm supporting a school of nursing students and faculty using Skyscape on Axims and iPAQs.
Here's Skyscape's own statement regardind WM5:
http://www.skyscape.com/support/Show...bid=343&cid=27
And if you're concerned about Skyscape working, download
Archimedes, which is free, and give it a try.
--Catt