Sometimes one needs to just search for a certain filename (like it was possible in 10.3 and before) without indexing the volume first. People have tried the strangest setups to achieve this, but there is actually a much easier way -- without installing any third party utilities: Sherlock 2!
Never used before (at least by the submitter), suddenly it now seems like a great app. Select the "find file" mode, enter the filename and search away, super fast. Beware: Needs Classic!
[robg adds: I no longer have any Classic apps installed, so I can't easily test this one...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20050622204527771