Depends on what your testing. 3DWangMark is fun, but it’s not the most reliable benchmark. 3DMark is the biggest one, though Aquamark (based of off Aquanox) is another mildly popular one. AMD’s nBench is another test, as well as VulpineGL…but those have never gotten much press, and I’m not sure if they’re still updated anymore.
Of course, games like Doom 3, FEAR, and FarCry get some heavy does in benching as well.