I upgraded my forum a month ago. Users like ithe new system and the new look & feel, including default theme.
My old favourite Babylon is broken in 2.0 as well as few others. I installed few 3rd party themes which are working correctly. Why they look nice, finally I returned to the default. But users can chose whatever they want (most are on default
I installed TinyPortal. It makes site more dynamic (eg. shoutbox) and gives more information, for example start page can show latest posts, etc. Also, you can put list of URL's, offer downloads and in general anything you can write in PHP, JAVA, ... I like TinyPortal and found it useful, gives a nice toolkit to customize site.
You may take a look at
http://forum.hasix.orgIt is in Hungarian, but language can be set to English. Let me know in a PM if you want an account. I get daily 30-50 spam registrations, so unknown foreign member registrations are rejected by default.
At the bottom there is a Facebook like button also.