Well, SQL Server 2005 SP2 was released a few weeks ago and we already (!) are seeing hotfixes for it:
Cumulative hotfix package (build 3152) for SQL Server 2005 Service Pack 2
http://support.microsoft.com/kb/933097
Critical Update for SQL Server 2005 Service Pack 2 (KB:933508)
http://www.microsoft.com/downloads/details.aspx?FamilyId=e2c358a1-ecc4-4c49-8f65-daa6b7800eec&displaylang=en