I'll test! This is the module I've been working on that prevented me from testing your image gallery extension. :-) I'll do some Q/A tonight.
Some initial bug findings:
Dates and Times tab -> Clicking on the popup calendar modal first throws a "Page cannot be found", closing that, I get the date selection screen. I'm in Firefox, and am allowing scripts for the site. Not getting any javascript errors. The date selection screen also requires several clicks to get it to exit if I'm not picking a date.
Dates and Times tab -> The times always save with a date of 1/13/2009 (today's date), could be confusing to people, even though I understand only the time portion is used on the front-end.
Dates and Times tab -> Blank entry is also created during save/publish. Not a big deal, but again, could be confusing to people.
Feature request:
The advanced calendar I see has a category (type). Would it be possible in the site tree to branch out the types? I'd imagine it would be an easy extension I could do myself, just curious your thoughts. More importantly, could the types be manageable through the admin interface, or only hard-coded? (This is one 'feature' of SS I'm still trying to implement properly without requiring a whole separate admin top nav element).
I'll play with it more tomorrow, I couldn't really get much else to break.
GREAT JOB!