I believe in past lives, but not karma. I like to think that reincarnation is just part of the natural order of things. Just a cycle of souls, kind of like how the water cycle just exists, with no set plan or purpose putting it in motion. I don't really believe in higher powers.
Kind of odd, I know. It's hard to explain. One friend of mine called me an existential dualist. I believe in things like souls, spirits, auras, and the like, but not in any higher power or fate. I just see things like souls as a part of nature. They just exist, with no more grand meaning or purpose behind it than how a tree just happens to exist or a rock just happens to exist. They're just harder to notice than the rock or the tree.
I suck at explaining things. Basically, yes, I believe in past lives. Not in karma, though.
Sorry for my tl;dr. D: