I recently started learning Tai Chi. Matt, my teacher, is an all-round lovely person and the class size means we all get as much attention as we need. The great thing is that through the physical actions it complements and enhances a lot of what I feel are the more positive aspects of the way I think. I'd recommend it to anyone so check out the Wikipedia entries on Tai Chi Chuan. We're learning a style developed by Cheng Man-ch'ing which developed from Yang style as taught by Yang Ch'eng-fu.

The philosophy that surrounds this stuff is very interesting. This page on the Taiji at The Wikipedia goes as follows:

"...the Taiji is the infinite, essential, and fundamental principle of evolutionary change that actualizes all potential states of being through the self-organizing integration of complementary existential polarities. From their mutual existence a state of dynamic equilibrium comes into being, which is the expression of the Taiji."

Baguazhang also looks really interesting....

Update: It's a useful exercise to apply this to every situation that confronts you as it really benefits your critical faculties. Returning to this decade's most popular subject, the war on emotions, we have been told that there is to a be a war on terror which is also a fight against evil. To eliminate this 'terror' we have to understand that the source of this terror does in part originate from the hegemony imposed by the West on societies rich in resources whose leaders wish to resist exploitation as a springboard for their own will to power. In some sense this is therefore a war against ourselves; the forces that are seemingly in deadly opposition to each other are intrinsically linked as well as created by the 'other'.