Regarding BB Unite. If you are not a VERY experienced blackberry/computer user I suggest keeping away from Unite.
It killed my BB Browser causing me to do a complete Wipe and restoration.
To get it to work I made several modifications to my computer firewall settings that now I wish I hadn't.
It may work as advertised for some but a word of caution from someone who had a failed attempt.
blackberry groups does seem interesting, I did like the idea of media sharing with unite, so I could easily grab music off my computer at home, I wonder if there is any chance BB Groups will incorporate any of that?
I saved the install file for BB Unite! before it was discontinued. Uploading to my server now. Will post again with download link when upload is complete.