I agree the search could use work. Right now google is best. You can limit your google results like this: wm6.1 manila 2.5 site:forum.ppcgeeks.com
Terms like 6.1 and 2.5 are too short for the normal search but they're important. You can search for them in the tag search but you can only search one tag at a time, which is done.
Maybe whoever runs this forum would be willing to install this vbulletin mod. It allows you to search multiple tags. Makes things much easier to find.
http://www.vbulletin.org/forum/showthread.php?t=210595