Layout changes not mentioned in Rachel's update Answered
There were two fairly substantial (from the user's perspective) changes that Rachel forgot to mention in her Site Update post.
First, by moving the search box and button up to the masthead, they have also eliminated the old-style "graphical search" interface completely. It doesn't even show up as an alternative when a Google-driven search is made. This has already led to two user complaints (here and here). Could the old-style interfce at least be put back on the search results page?
UPDATE 17 Aug 2010: The "graphical search" link is back on the search-results page.
Second, the interface when you first read an Instructable has been cleaned up substantially. All the steps, with photos and hover-text, are still there, but instead of a truncated table of contents (only the first ten steps), now the full intro and first step are shown immediately. It'll take a bit of getting use to for the old-timers, but I think it's a better interface for new users.
Thanks to Rachel for getting these updates out, and especially for answering (pun intended) some of the requests from the community!