I think that's about what I had at 66.
If you are looking for more, Enchanting, tailoring and Mind Mastery are the 3 easiest ways to do so, but I wouldn't go crazy on the enchants until you slow down with the gear upgrades as they can get expensive. All of the 300+ tailoring sets that are not based on resists seem to have good +spell damage, even the green Netherweave set. The level 70 epic tailoring sets are just ridiculous. Enchanting everything (including Aldor/Scryer shoulder enchants, Runic or Mystic Spellthread and Sha'tar head enchants) will give you about +150 more spell damage, but yeah like I said this can be expensive until you know you're sticking with that gear for at least a few weeks. And last but not least Mind Mastery gives about +100 though it is very limiting in terms of spec options. Most actually choose not to get Mind Mastery at this point.