An awesome site that needs more atteniton is openraid.us. Create an account and go on the forums to find groups that are forming or make your own group. This site is perfect for raiders who cant find a consistent group, need gear from 5.1 raids (heroic or normal), or you have a super tight real life schedule. Seriously, go check it out becuase i think its new it needs more active raiders.
Good site to use. Our guild is a very small so we would never have enough people to run a 10m (have problems getting 5 online for 5m...lol) and I enjoy it cause I would prefer to raid then others.