SQL Server 2008 : http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=66ab3dbb-bf3e-4f46-9559-ccc6a4f9dc19
CU 1-7 after SP1 installation:
CU1: http://support.microsoft.com/kb/969099
CU2: http://support.microsoft.com/kb/970315
CU3: http://support.microsoft.com/kb/971491
CU4: http://support.microsoft.com/kb/973602
CU5: http://support.microsoft.com/kb/975977
CU6: http://support.microsoft.com/kb/977443
CU7: http://support.microsoft.com/kb/979065