The good people at VSoft have done it again. FinalBuilder 4.0 is out and running, and I couldn't be happier advertising for it on this blog. One of the best products I've used for build management, and it gets better every release.
If you don't have a team large enough to justify Team System, This thing is definitely one of the first options I'd check for a light and easy build process that can scale and be maintained easily.
(If you have a product so good that I'd ramble about it on and on like this, tell me about it. If I like it, you can advertise on this blog too and appear near the top left)