k.
Themes --
There are two green/grey themes called Rocksteady and Rocksteady (babylon). Those and the Core theme are the only ones with all the features at the moment. BlackDay looks like a keeper at this point too, but we'll see.
Gallery --
You should be able to make a personal gallery once under this menu, and create event galleries. don't get crazy tho, there's no delete yet except for administrators, that i've seen. Your personal gallery will show up at the bottom of the crappy default profile summary that's up now.
Bookmarks --
Works just like "watched threads" did on the other site. I'd like to get checkboxes and "delete all" buttons eventually, but go with it for now.
Calendar --
Should work out of the box. See the sticky in the parties thread on how to format your thread titles and such so they're usable.
User Map --
Under your profile where you can change the settings, it has a google map for you to put a pin on. This will give us your location for eventually calculating distances, as well as make an entry in the global map available under this menu option. Play around, i don't think you can break it.
If there are any other questions about how these work, drop em here.

ROADMAP --
Personally, these are my priorities:
Make Maps work (check!)
Profile Galleries (check!)
Better Profiles
Active Topics
VKs
Event Attendance List
Online Users / Chat integration
Member Search by location
Event Search by location
Better Mailboxes