The search button on Newsgator's online RSS reader is improperly positioned in ToT (see attached screenshot). When the reader is loading, the page contents starts out and for a brief moment, the grey area at the bottom is higher up in the page. When the feed list is populated, it is pushed down, but the search button does not follow suit. Use the login information from bug 14808 comment 0 to login. You may need to reload the reader a few times in order for it to reproduce.
Created attachment 19243 [details] Screenshot Firefox 3 Beta (for reference) vs ToT
I also think this is a regression, but do not have an old enough version of Safari around at the moment to test that out (hence the P2 treatment).