If you updated your wifind and notice that it's still not working with Leopard then there is a fix at the taste apps website:
Some builds of Leopard seem to have an outdated version of SIMBL. WiFind requires the v0.8.2 (or above) in order to work properly on OS X v10.5 (Leopard). If you are running WiFind v1.4 (or greater) and run OS X 10.5 (Leopard) and WiFind does not show up in you airport menu, download & install this version of SIMBL.
Link is under the faq for wifind. Also wifind is now at the bottom of the airport menu.
WiFind
adds signal strength & security info to AirPort menu
Version: 1.4.3
Update to SIMBL - dennis.hollett
Oops just as i posted this i noticed the sleekdj's post about updated simblReply to This
Saturday, December 15 2007 @ 01:57 PM PST