What would be the first step of getting ready for .net 3.5? 
Correct: Update your posters!

Get rid of the old types & classes posters now and replace it with a freshly printed version 3.5 poster. Even the visualization of the red/green and blue bits has changed so be prepared for the next wave...

 Poster download: http://download.microsoft.com/download/4/a/3/4a3c7c55-84ab-4588-84a4-f96424a7d82d/NET35_Namespaces_Poster_LORES.pdf

 Source: http://blogs.msdn.com/pandrew/archive/2007/11/02/announcing-the-net-framework-3-5-commonly-used-types-and-namespaces-poster.aspx.