I use Agent Ransack at home and at work for searching for files, but just recently I found Ultrasearch made by the guys that created Treesize. The file search works by searching the MFT of NTFS directly instead of drilling down into the file system itself or an index. The nice thing is that not only are the search results nearly instanteous, you don’t have any of the issues of hard drive thrashing or worrying about hidden files.
I placed the executable on a share on my Windows 7 PC and I was able to run it from an XP machine just fine remotely, so this can be used as a portable application. Best of all: it’s freeware!
– Soli Deo Gloria