The following are some great links to check out:

cars101.com - A great site for subaru specs from invoice prices to stock gear ratios.

nasioc.com - The North American Subaru Imprezas Owners Club. Sure its got "Impreza" in the title, but its a great resource for all Subaru owners. Search thousands of post or get in tough with fellow enthusiasts in your area.

scca.com - Sports Car Club of America. Check out the latest rules and events going on in your area.

subiesport.com - A magizine dedicated to subaru enthusiasts.

pdadrivingschool.com - Performance Drivers Association. Check out this site if you're in the northeast and are interested in getting some track time at real courses.