We're big fans of the Cobbler project here at Eucalyptus. We think it's the best tool in the open source world for bare metal provisioning. We've invested in a gigantic QA environment for continual integration testing, and Cobbler is one of the linchpins of that environment. It's the kind of tool that's best appreciated by sysadmins who deal with *a lot* of systems.
Eucalyptus + Cobbler looking to raise $4000!