The custom google search box that appeared at the top of every forum page disappeared in the format update. Wanted to see what other people thought of its usefulness, and how difficult it would be to get it back.
I thought this was an incredibly helpful feature. The fuzzy search algorithms made finding a topic based on a number of key words a snap. Instead of wading through dozens of results on any particular topic in the forum search, the first results are more likely to be relevant.
This is particularly useful in the supplements/nootropics section. Finding individual aspects of any particular substance (dosage, specific side effects and properties, combinations and interactions, etc.) is a hugely powerful research tool. Not to mention that it cuts down on the number of bewildered "OMG where do I even start?" and UTFSE threads.
Also very useful to find previous threads to post in, reducing the chance of fragmenting discussion needlessly into a new topic.
I'll note that you can still do this by adding site:imminst.org to a google search, but it's considerably less convenient without the custom search box.