Sweet. I run this setup on Mac 10.5.7 and it's great (PHP & CFML on port 80, that is).
The easiest solution is to reinstall CF as a multi-server and run the connectors for Apache. The most recent CF (8.0.1) Mac installer is 'built' for Leopard, so it works well.
Mark Drew has a good post:
http://www.markdrew.co.uk/blog/post.cfm/running-coldfusion-8-on-leopard
Aaron West also has an excellent post on CF 8 & Leopard:
http://www.trajiklyhip.com/blog/index.cfm/2008/1/14/ColdFusion-8-Apache-22x-and-OS-X-105-Leopard
If you run into a snag, PM me & I can help more (I've freaking installed this $%&@ thing so many times
)!