If you’re looking for MDT 2010 Update 1 then Microsoft STILL provides download links for it:

http://www.microsoft.com/en-us/download/details.aspx?id=2932

All other links have been replaced with MDT 2012 so grab it while you can!

One thing to keep in mind here is that official Microsoft support for MDT 2010 Update 1 ends in April 2013.

Enjoy!

EDIT – 3rd of December 2013

Looks like Microsoft have taken the links down – I have uploaded both x86 and x64 versions here:

MicrosoftDeploymentToolkit2010_x86
MicrosoftDeploymentToolkit2010_x64