The important bit is the fix in SiteStudio 809 that allows Contribution Mode to work in Firefox 13 and up. I'm also happy to report the SiteStudio Manager panel works too in the latest Firefox.
But that's about it. Just a couple of other minor bugfixes.
If you're still on 10g you can use this latest SiteStudio 11g, just switch to using Java 1.6 in your intradoc.cfg file.
In Content Server, there is one new feature I'll mention, the internet-style search syntax for metadata fields. (I think it's already available in the QuickSearch but it can now be used on any metadata field.)
Spaces are treated as AND, commas as OR, minus as NOT, quotes as exact. They can be combined with parentheses.