First of all I can't wait for 5.7! On that note, will there be added support for nginx? C5 is a pretty intensive application and using something like nginx officially would make for some really nice speed improvements. I've seen some tutorials floating around the web but still am unable to get my install to work with it leaving me stuck with Apache.

Also, I'd like to +1 for Google Apps for SSO.

Thanks so much for such a sweet CMS and I look forward to its release!