I've noticed that combat was going a bit slow for other players in a game I'm playing in, so I shared my method of speeding up my turn with them and it's speeded up greatly. This may be similar to power cards, but I haven't heard of them until this thread.
I write down all my abilities sorted by at-will/encounter/daily and calculate my plus to hit with that skill, the total damage it does, and any other effects as like a cheat sheet. That way, I can look at it and say "I cast scorching burst, (Roll d20) plus 8 is 20 vs. Reflex. Hit? Ok, 1d6+7 (Roll d6), 13. Done." Having everything precalculated for feats and racial abilities helps streamline combat for me.
In addition, we use 5 colors of poker chips to mark mobs. Red chips mean the mob is bloodied, purple means he's marked by the paladin, blue by the warrior, green warlock curse, and white means a status effect that I need to remember on their turn. This resolves a lot of questions, such as abilities that add to damage or hit when a mob is bloodied, who the warlock has cursed (although since she got her rod of corruption we've been marking who's NOT cursed), and provides an easy indicator of status effects I may have forgotten since they were applied. The only problem is that poker chips are much larger than 1 inch squares, so I'd like to find either smaller ones or a different method of doing a similar thing.
-Krensus