Seam 3 and Maven 2
Although Seam 2 has a great tool in seam-gen, which facilitates the common tasks of a Seam developer, it's using an ant-based build system. That's not too bad in itself, but probably a Maven-based project would be better.
If you think like me, rejoice, as Seam 3 will use Maven 2 as the primary build system. The SVN repository has been updated to reflect this change. Beware Seam 3 is still under development, with no release date planned, so in the meantime you are stuck with Ant. But the future looks brighter ;)