I know that a lot of people were sad that we switched from +word to "word" to do an exact match for a word. The good news is that we're rolling out a "literal mode" that will search for exactly the words you typed. It does a verbatim match with your words, so it turns off things like spelling corrections, stemming, synonyms, optionalized terms, and so on. I think we saw multiple proposals for this on Hacker News, so…
Still waiting on being able to search for punctuation. Being able to search for "$. ruby" or "$_ perl" or "$: edit: Just realized "$_ perl" actually does work. It would be nice, however, if we could search for these kinds of terms generally and not just in specific case.
One of the biggest problems I have with Google search at the moment is when I need to look up specific functions or symbol names. If I'm looking for documentation on g_find_str, the LAST thing I need is to see results that contain "... are going. Find string is a ..."