Really depends on your comfort limit for a DD. You've already done a lot of the easy things. Random recommendations that may or may not suit you:
*) Lightweight racing seats. Pretty expensive, but they reduce weight and also generally lower the center of gravity. Some of them are comfortable enough for DD use, although I'm not so sure about really long road trips.
*) If you don't care about audio, you could remove all of the audio stuff as discussed a few posts up.
*) Windshield washer reservoir can be removed to take a little weight out of the front passenger corner. TBH it doesn't weigh a whole lot though, you'd get nearly the same benefit just emptying it out and leaving it dry instead of lugging around a gallon of water up there.
*) There's a heavy metal weight on the underside of the rear lip of the trunk lid that can be removed. It's just there to balance with the struts to make the lid easier to open/close with minimal force. It's under the plastic and pretty easy to reach.
*) Switching to a set of straight braided brake lines (like CZP's) removes a bunch of factory mounting brackets/bolts/etc for the stock brake lines. I don't think I ever weighed it all, but it's a few lbs of unnecessary unsprung weight.
*) If you're not concerned about emissions testing, the FI Long Tube Headers cut some weight vs stock manifolds + cats.
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