Hi everyone, using q2a for half a year now I am happy to use it every day. Gidgreen, NoahY (plugins) and Scott (plugins) and others have done a great job.
One thing that bothers me, though, is the search that is based on single words. In most of the cases I cannot find easily what I am searching! And then I am using google.com with the site-operator, e.g. site:question2answer.org search algorithm
Essential things that are missing for the recent search algorithm:
1. Exact match search, e. g. "I am happy"
2. direct user search
3. full text search, proposed here
Optional:
4. Showing extract of text with search term inside, like google is doing it.
5. sorting search results, proposed here
I hope that the search can be improved for 1.5.4 - quoting gidgreen: "I know it has to get there in the fullness of time!" 
PS1: I have never found a search plugin / module that is capable of the things mentioned.
PS2: Exact match search, i.e. search with quotes should be implemented. Request from here.
PS3: There is also the "related questions" search algorithm that could be improved (not only search other titles but full content).
Final-PS: Check out all the improve-search-requests here in the forum, that's why I consider it priority A.
