While leveling there aren't exactly a Feral rotation, except in instances where you want to follow the end-game rotation as much as possible, with the exception of Savage Roar which doesn't become available until level 75.
You've got several options for solo rotations, based largely on your talent selection. Do you have Improved Shred? Do you have Improved Pounce? Do you have Improved Mangle?
As mentioned, Mangle spam will get the job done in most of the cases, but if you're feeling frisky, spice it up with a Rake, Maim, Shred. See if you can stunlock stuff for kicks. Pounce, Mangle, Rake, Maim, Shred, Shred, Ferocious Bite. Yeah, it's all good.
Once you have Rend & Tear, applying either Pounce or Rake to your target will increase your crit chance with Ferocious Bite by 50% or something sick like that. Pounce, Mangle, Shred, Ferocious Bite was usually all it took for me at those levels. You can also mix a little Bear form into it and perhaps make every second pull a pack pull. I run with the Maul glyph and coupled with Berserk, your Bear puts out some pretty impressive damage. Taking on 5+ mobs at a time wasn't difficult from what I remember.
You're playing one of the most versatile classes in the game. Take advantage of that! Spice up your game. Try flying high above something and then switch to Bear/Cat form and Charge something just before you go splat. It takes some practice, but it's really fun. Or maybe my humor is just sick, I don't know.
Oh, using Savage Roar in your soloing rotation is optional, really. It's a very short buff and requires you to spend combo points. I personally never used it outside of instances. Instead of a 24-second damage boost, I preferred the 4k Ferocious Bite crit.
Edited, Nov 3rd 2009 3:56am by Mazra