The only indy promotion I watch regularly is ROH. Tbh it's because I don't really know where to go to watch other indy wrestling. Since I may take a break from WWE after 'Mania I would like to get some links and such for good indy promotions.
Well to sample what promotions you may like you can look through Youtube and the fed sites where many feds have free matches and storyline updates like Chikara, Absolute Intense Wrestling (AIW), AAW Wrestling, Beyond Wrestling, etc. For full shows though you'll either have to buy the dvds, buy the downloads/stream the shows or go to the indy media section to download.