iPhone Coding: Build your Leopard toolchain from scratch
Why settle for out-of-date toolchains when you can build the latest and greatest from scratch. Nicholas "Drudge" Penree put together this handy how-to that walks you through the process.
Be aware that you'll need to be running the gold master version of Leopard with the latest XCode release. These instructions do not work on the prerelease developer builds.
For more information and for peer support, head on over to irc.osx86.hu to the #iphone-dev and #iphone-uikit channels.