Originally Posted by
Daetur
Starting to work on reputations is a great way to kill multiple birds with one stone, so to speak. You can work towards the 25 Tabards achievement, things like the Ambassador or Diplomat titles (or Guardian of Cenarius, a great title for a druid, imo), and your choice of the "x number of mounts/pets" achievements at the same time, since some reputations will award mounts, others tabards, and some pets. There are even some-- such as the Sha'tari Syguard-- that have all three.
You can also look into using OpenRaid.us to find old content achievement/mount runs and such, if you're comfortable giving out your RealID to the raid leaders (have an authenticator for added security if you want to do this).