I just upgraded and am already not too thrilled. I think I will be going back to 3.4.4.
Sociable 3.5.0 added a new element to the post editor page, displaying RSS feed content from BlogPlay.com, and there is no way to disable it. Very aggravating! Booo Blog Play. Your site stinks btw. Everything is so ridiculously big It looks like you designed it for the visually impaired. Long live Joost de Valk! Booo on PlayBlog.
Take away the clutter you are forcing us to view.