This time I wanted to mention cool new feature in SCCM 1511 - the ability to schedule WSUS cleanup. Previously this was only possible through WSUS console. This lead to admins forgetting that WSUS cleanup was necessary and this in turn lead to a huge WSUS database which caused various errors.
So here it is - just open SCCM console, navigate to Administration - Site Configuration - Sites - right click to site - Configure Site Components - Sofware Update Point - Supersedence Rules and check "Run WSUS cleanup wizard"
So after selecting to run WSUS cleanup it will run after next SUP synchronization and the after 30 days. Unfortunately I haven't found so far if this 30-day interval can be changed.