I guess it varies person to person, but I find taking a walk really helps me reduce my anxiety at that moment. Talking with friends, playing a game (even solitaire), cleaning up, drinking a glass a water (helps me regulate my breathing - sounds weird, I know) seem to help, too. This website and this forum helps a great deal, too. Looking towards positive things to come also helps a lot.
Some things that I find aggrevate my anxiety symptoms: watching tv, reading, pretty much anything that allows me to dwell on my symptoms.
Hope this helps. Let me know if you share similar experiences with the above!
Brad