[]any links to an actual site running w/ threads?[/]
http://www.spelwebben.seBut it is in Swedish unfortunately. There might be an English one opening soon, I'll ask if I can post the link to it.
[]what about 6.5?[/]
Haven't had time to try it in 6.5 but I don't think there should be any problems. I'll get the instructions updated in time for the 6.5 release hopefully. I'm also planning on updating it for Mambo 4.6 when it is released.
[]Why does the log in/out use the Mambo instead of threads? [/]
To minimize the needed modifications to make the installation as easy as possible. Also, it is easier to find bugs if I only I have to check in one place. Internally, it's same database and cookies as before in both Mambo and UBB.threads, so everything works the same as before.
[]Is there a fix for safari? The popup menus don't work w/ safari.[/]
What popup menus are you referring to? If it is the ones in Mambo, I think they are correct html so it's probably a bug in Safari. I know it works in msie/firefox/opera at least. The menus are a GPL:d javascript functions too called JSCookMenu I think, you might want to ask the authors of it as well.