Unfortunately Silverlight 5 Toolkit Samples are missing.
I also unpacked the Silverlight_5_Toolkit_December_2011.msi file for being sure.
It does not contain anything like System.Windows.Controls.Samples.xap which existed in Silverlight 4 toolkit.
Anyway: I like the Silverlight 5 Toolkit very much as it adds extra value for the developer.
Comments: ** Comment from web user: Birbilis **
I also unpacked the Silverlight_5_Toolkit_December_2011.msi file for being sure.
It does not contain anything like System.Windows.Controls.Samples.xap which existed in Silverlight 4 toolkit.
Anyway: I like the Silverlight 5 Toolkit very much as it adds extra value for the developer.
Comments: ** Comment from web user: Birbilis **
it might be at SampleSource folder in http://silverlight.codeplex.com/SourceControl/changeset/view/76139 (or whatever the latest version url is in the future)
I did download SL5 version from MS, however I see Silverlight3 and 4 subfolders at the source (guess SL4 version works for SL5 too)