I found very cool poster Dan Wahlin posted on his blog. It’s about common types and namespaces in Framework 3.5.
If you were asking yourself what to put on the wall behind you, this might be your answer 
View it and download it from this location: http://weblogs.asp.net/dwahlin/archive/2007/11/14/net-framework-3-5-common-types-and-namespaces-poster.aspx