Para 2 is a big fan favorite and I really like mine as well. It's just good for all around EDC, slicing, cutting cardboard, and some other heavier tasks as well. And the compression lock is just ridiculously awesome and fun.
A few other favorites of mine are - Spyderco Chokwe - Big knife that doesn't feel too big, has the perfect amount of edge, extremely ergonomic despite its looks, and the blade shape is just perfect for EDC tasks.
Spyderco Techno - Small but a beast! Can handle anything you throw at it, slices well, feels great in the hand, excellent steel, and I really can't say enough good things about it. The deep carry is awesome too.
Spyderco Urban Wharncliffe - Can you tell I like Wharncliffe blades yet? This has to be one of Spyderco's best slipits. The orange color is awesome so you can see it, it's small yet fits the hand like it was made for it. Deep carry like the Techno, and you don't even notice it's in the pocket. The snap on it is great but the action is smooth. Again the Wharncliffe just laughs at EDC tasks. The VG-10 steel is good, holds a good edge and sharpens up easily.
Not sure if you're asking because you want to know or because you're looking for a new knife.
If looking, none of the above will let you down.
Spyderco Squeak is also a great little knife and you can get it cheap. For a small knife, it holds it's own, nice ergos, nice steel, holds a good edge, etc. $40 and I can't get enough of it. =]
What's a "favorite" thread without pics?
My Squeak with my DPX H.E.S.T. 2.0:
Para 2 and Squeak(Kiwi was along for the ride in the first four):
Para 2 and Urban:
Chokwe and Techno: