I've done the MCSA/MCSE and MCDBA (dba was one extra exam on top of mcse carefully chosen electives!).
All on Windows 2000 and SQL 2000. Am looking to upgrade to XP/Vista/7, 2003/2008 and 2005/2008.
2003 exams probably first, then the 2008 upgrade path. I've just left it too long to do the 2003 upgrade
Really can't get myself motivated though
MCP, MCSA and two exams away from MCSE, looking to finish 2003 and than re-certify 2008 when the courses become available.