You can download the new SQL Server 2000/2005 JDBC Driver here.

If you have not been following this is a new JDBC driver that we built from scratch(the previous one was licensed), it includes perf and transaction support improvements as well as support for new SQL Server 2005 features such as XML. We are still working on getting it certified with the common J2EE App Servers so watch this space.

Oh and did I mention it was free?