Well, as you've probably noticed we've upgraded to Theme Builder 3.0 and Community Bubbles 0.9.41, complete with a new design and a growing number of social networking features appearing for logged-in users.
We got rid of the tabs because they were just too much of a pain to maintain and slowed the site down with all the excess graphics. We've not yet decided what the best way is to give quick access to key sections of the site so we've enabled the default Confluence dashboard to allow site-wide navigation.
There will be loads more changes over the next week or so as we fine-tune things and add even more Bubbles functionality. When Confluence 2.6.1 or above is released we'll also be introducing several community spaces, forums and mailing lists – then you'll really be able to see what Bubbles is all about.
I'm just glad we finally got round to upgrading our site a bit - it's feeling much more healthy now and the performance improvements in Builder 3 have almost hidden the performance degradation caused by our un-tuned single sign-on (SSO). Hopefully we'll get round to tuning our SSO before the end of the year which should result in blistering performance 
Kudos to Alain Moran for his "Global Thermonuclear War" button in the theme admin which allowed me to zap a bug that had been preventing the use of Builder 3.0 on the site
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