I already posted this in another thread, but it might be overlooked. Someone did an awesome job putting every single enchant and gem in a spreadsheet, that shows what each enchant does on each level.
So if you are looking for the best enchants on your Twink, Heirlooms, or simply because you are an enchant freak, this is the 5.4 Enchanting Bible
5.4 Enchanting Scaling Spreadsheet
Edit, source unknown, but credits!