I'm sure most people here have heard that former Republican U.S. Representative Bob Barr has been nominated by the Libertarian Party to run for President. I think this has been rehashed time and time again, but what we have is a Goldwater Conservative Southern Republican... this guy can help turn states like Georgia and South Carolina blue if he is able to bleed support from McCain.
The Libertarian Party needs our assistance for ballot access in quite a few states.
Not on the ballot
Alabama
Connecticut
Illinois
Iowa
Maine
Massachusetts
Minnesota
Nebraska
New Hampshire
New Jersey
North Carolina
Ohio
Pennsylvania
Rhose Island
South Dakota
Tennessee
Virginia
West Virginia
Edit: The only thing you can really do at the moment is either call your local Libertarian Party HQ, or donate money towards their efforts at collecting signatures.