If so, how well have you gotten it to run?
I'm running XCode 3.1.3 with the iPhone SDK 3.0, and all official stuff seem to work. The display is a bit small for the simulator, though.
Only problem is I cannot get build&go working with real (jailbroken) hardware without a developers certificate — I followed this guide http://www.ipodtouchfans.com/forums/showpost.php?p=1663055&postcount=10 on my desktop hackintosh and it works well, but I cannot get it to work on my eee pc. Both run iPC updated to 10.5.7, and I really don't see what I've done differently on the desktop..
edit: I got build & go working using the patch on this page: http://www.iphonedevsdk.com/forum/iphone-sdk-tools-utilities/20983-sdk-3-0-xcode-3-1-3-build-go-jailbroken-device-2.html