Two incredibly popular machinima makers have recently returned to make their mark on the WoW community. I'm only listing them in alphabetical order here.
Myndflame has been incredibly busy, from some new songs to a full album. If you've got some time or a few loose pennies, take the time to swing by Myndflame and support their art. One of the best ways to get more of this creativity into the community is to help out the people doing the art, and Myndflame is certainly deserving.
Yumfries is also back with a new video called STUFOOH! The video has some adult concepts and blue comedy, so be warned that it's not necessarily appropriate for work. Yumfries has always had some ironic commentary about the community and its "celebrities," and Nub Tales has been especially insightful. STUFOOH! is probably going to be a little controversial, but it's worth the watch.