If you try and install the Team Foundation Server Power Toys (or Tools) on a Vista machine, you may well see the following error:
Error 1721. There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor.
Solving this is quite easy; you just need to fire up a command prompt using the Run As Admin setting and use the msiexec command line:
msiexec /i "tfs power tools.msi"
The reason for this is due to the increased security in Vista, for more information on this, see http://devreadiness.org/default.aspx