In reading this list, remember this is all based on my opinion/memory, so if I forget the most favorite of creatures, please feel free to add them in the comments. Some characters toe the line between creatures and characters, so let's eliminate characters that speak English from the mix (sorry Yoda- you're out of this list!)
(Make kids/geeks everywhere jealous with the Tauntaun sleeping bag!)
10. Tauntaun - This beast provided warmth for Luke and Han on the ice world of Hoth when Han cut his Tauntaun open so that he and Luke could climb inside. This also led to Han's excellent quote: "And I thought they smelled bad... on the outside!" I believe Jamie Foxx said something similar about Kirstie Alley!
9. Wampa - Speaking of Hoth and horned creatures, one ugly looking Wampa took Luke hostage in an ice cave and hung him upside by covering Luke's feet in ice! I'm no scientist, but this seems like an impossible scenario as you'd have to hold water around Luke's feet while it freezes leaving him upside-down. Still, Luke uses the force, grabs his lightsaber, frees himself, and cuts off the Wampa's arm- how very dark-side of you, Luke...
8. Three Creatures from the "Attack of the Clones" - Near the end when Anakin, Obi Wan, and Padme are chained up in the gladiator arena, three creatures come out to attack them- a Mantus, a Cat/Dog thing, and Rhino type creature. These are all pretty bad-ass, yet they all are defeated by the jedi. I'm always down for a Gladiator-esque arena battle- this one is just missing bengal tigers, Russell Crowe, and a telephone.
7. Jawas - Little entrepreneurial beings that ride around on sandcrawlers. They drive a hard bargain, initially sold Luke C-3Po and R2-D2, and constantly say "Tee-hee!" I don't know about you, but I want one as a pet. On second thought, maybe having one as a pet would be bad because it would constantly be trying to have yard sales with my things...
6. Colo Claw Fish - One of the only great moments from Episode I is where Obi Wan and Qui Gon are escaping from this massive fish in their little underwater cruiser. The moment is immediately ruined when this fish is eaten by another large sea creature and Qui Gon says, "There's always a bigger fish." Nice throw away line, George Lucas.
5. The Asteroid Worm/Snake Thing From "Empire" - When the Millenium Falcon lands on an asteroid and goes in a crater during "The Empire Strikes Back" there is no hint of danger. That is, of course, until they realize they are already inside some sort of worm or snake that wants to digest them. How they manage to escape from the belly of the beast is irrelavant- it still makes for a great movie moment (however ill-conceived it might be.)
4. The Rancor - Jabba the Hutt manages to trap Luke in a pit where the Rancor almost manages end Luke before he is able to schedule a rematch between him and his "come to the darkside" father, Darth Vader. Best part: When Luke sticks a bone into the Rancor's mouth!
3. The Sarlacc - This sandmonster is bad-ass! I came to this conclusion by the transitive property- because the Sarlacc actually eats Boba Fett in "Return of the Jedi," and Boba Fett is pretty bad-ass on his own, that means that the Sarlacc also has it's own legit street-cred. I mean, this thing is a mix between quicksand and a digesting hollow tree- what's not to like?
2. Salacious B. Crumb - One of my favorite Star Wars creatures has to be this little guy! All he does is sit in Jabba the Hutt's chamber and laughes at everything Jabba does to taunt guests and prisoners. His signature cackle is one of the best parts of "Return of the Jedi." He is the ulimate "Yes-Man" for Jabba.
1. Chewbacca - The creature probably should count as a character, but he is the favorite Wookie, Chewbacca. He's quite involved in Episodes IV-VI and even makes a cameo in Episode III (Yoda loves riding around on shoulders, doesn't he?!) As Han Solo's trusted friend, Chewie is not only a cool creature, he's also a hero. Now can someone explain to me why all the Ewoks look like a Wookie got busy with a whole bunch of Endor midgets?
So that's it! May the force and what-not be with you...