Download the Community Technology Preview (CTP) version of the SQL Server 2005 JDBC Driver 1.1, a Type 4 JDBC driver that provides database connectivity through the standard JDBC application program interfaces (APIs) available in J2EE (Java2 Enterprise Edition).

http://www.microsoft.com/downloads/details.aspx?familyid=f914793a-6fb4-475f-9537-b8fcb776befd&displaylang=en