Anabolic tends to do a lot of videos with rimming, if you're into girls doing guys, that is. Their videos are generally good quality too.
I'm a fan of the Gangbang girl series, which usually features analingus, but there is another series called Oral Consumption which I haven't seen that focusses on eating ass, feet, cum, and I guess everything else worth mentioning.
You can find a lot of analingus scenes in just about all of the "Whack Attack" series, and also "Cum Back Pussy" films (especially #6). Both film series are produced and directed by Tom Byron.