Try this: connect to a FTP server by selecting Go -> Connect to server. Then enter, as a test:
ftp://ftp.apple.comHit return to connect, and Apple's FTP server will mount on your desktop. Next, type Command-F and specify that you search only on the mounted FTP server from Apple. Try a search for "update" and it will remotely search for any file names with "update" in their title. Very nice...
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021025070638912