<p>I assumed there were only bug fixes/(no new types) in .NET 2.0 SP1 until I came across <a href="http://davesbox.com/archive/2008/08/25/new-for-visual-studio-2008-sp1-and-fxcop-1-36-multi-targeting-rule.aspx" rel="nofollow noreferrer">few</a> posts which were mentioning <a href="http://msdn.microsoft.com/en-us/library/system.datetimeoffset.aspx" rel="nofollow noreferrer">DateTimeOffset</a> structure, that was added in .NET 2.0 SP1.</p>

<p>Is there a full listing of the newly added types in .NET 2.0 SP1?</p>

Here's what you're looking for:
Full Article:
http://www.hanselman.com/blog/CatchingRedBitsDifferencesInNET20AndNET20SP1.aspx
This may also be helpful:
Full Article:
http://www.hanselman.com/blog/ChangesInTheNETBCLBetween20And35.aspx