Flyshare.com
 

Has anyone used this service? I just read about it in Budget Travel mag. it links up private pilots and passengers (pay a share of gas) Sounds like an interesting idea,it looks like it is fairly new as not alot of flt.ops at this time but it has growth potential,check it out

Private pilots need to be wary of the, "Common purpose" requirement which is not spelled-out in the federal aviation regulations:
http://www.avweb.com/news/avlaw/186346-1.html#Section4