I'd be careful about aerating right now unless you want a lawn full of weeds this winter and Poa in the spring. If you do, be sure to Pre-emerge before the temps start to warm.
Also, for you guys w/ Bermuda, now is the time to hit any crabgrass w/ an MSMA based prodct if you need to.
Also, after we get a couple of good morning frosts and the Bermuda is completely dormant, you can spot treat through the winter with Round-Up to kill anything that is green, AKA weeds, w/ out harming the Bermuda for the following spring. The farther south you are, and the warmer the winter is, the more dangerous this becomes, but it should be ok for everyone from Houston-ish north, just make sure the Bermuda has lost its green before you spray. If it's brown, it's Round-up safe; if it still has a little green, I'd be careful.