They're decent, but you could do a lot better. What video card? Motherboard? Case? PSU? I recommend a SATA-compatible motherboard and a SATA hard drive for cleaner cables and higher performance over the IDE. Also, I highly recommend AMD over Intel at this point. They've proven to be the superior CPU. That'll most likely change come the release of Conroe, but that's not really relevant to the discussion.
It's also important for you to tell us your main uses for this PC, because that can greatly affect what hardware you should get.
Edit: Are you building this yourself or buying it prebuilt? If you're getting a prebuilt, you may want to tell us the retailer you're doing business with.