When you get a message like " THIS.kext was installed improperly and must be reinstalled" it's because its permissions are wrong (because I didn't make the pkg correctly ... sorry). To fix the permissions on a kext, you must open a Terminal, and type :

sudo chown -R root:wheel /System/Library/Extensions/"the kext"
sudo chmod -R 755 /System/Library/Extensions/"the kext"

And reboot.

PS: There's a wiki. It's actually updated regularily, don't forget to check it.

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Mac OS X 10.6.3 • 2.8 GHz Intel Core I7 860 • ASUS P7P55D • 2 GB 2 Ghz DDR3 • ATI RADEON XFX 4890 1GB • 2 x Hitachi 160 GB Serial-ATA • PIONEER DVD-RW DVR-112 • LaCie Desktop Harddrive 750 GB USB