I find that doing a 10-20minute yoga routine can be very helpful with anxiety. Its basically movement and deep breathing. The combination of stretching, concentrating on breathing and listening to the wii instructor usually does a pretty good job of clearing my head.
Also the last month or so i have been working on my garden alot, and like @halfpast2 was saying just doing that and weeding is really quite theraputic
Reading a book or the newspaper is sometimes helpful. Getting into a good book can just take you away from your worries!