The guys over at daemonite have written detailed instructions for those of you who absolutely have to have ColdFusion 8 running directly under OS X Leopard.
Unlike the instructions posted earlier by Mark Drew (which apparently have worked for some and not for others), this installation is not for the faint of heart.
The standard ColdFusion installer for OSX has no web connector for Apache 2.2, so you're going to have to compile your own using the XCode tools found on the OS X DVD.
That said, one has to wonder to why there's no 2.2 connector in the first place?
After all, the fact that Apple has been planning on upgrading Apache 1.3 to 2.2 has been posted on the public Leopard Server page for months now. Adobe received quite a bit of flack over the delay in porting the ColdFusion MX 7 Java code to the Intel platform, so you'd think that they'd want to get ahead of the game for a change with upfront support for both Apache 1.3 and Apache 2.2.
But apparently not.
Again, I still maintain that if you're doing ColdFusion development under OS X, you need to consider running ColdFusion under Windows using Parallels Desktop. Running Parallels gives you multiple virtual machines and configuration environments, and running Windows gives you access to SQL Server and also to Internet Explorer for browser compatibility testing.
This obviously doesn't help if you need ColdFusion to run under OS X Leopard Server, but deploying the above for anything but testing doesn't strike me as falling under the "smart" category.
Regardless, the boys at daemonite have put together a nice set of instructions, and take it from me, anyone who can work "Nuke it from orbit, its the only way to be sure." into an installation guide deserves some kudos.