Content Slide Templates for PowerPoint 2007
Free PowerPoint 2007 content slide templates to download.

Indezine - Free PowerPoint Templates
Check out this site for a free PowerPoint template every day.

AV Partner
Several free PowerPoint templates designed for business.

Presentation Helper
Several free PowerPoint templates designed for business.

Techsmith
Free PowerPoint templates to use in conjunction with Techsmith's powerful Camtasia Studio program -- a program to make animated videos.

Master Templates
Limited number of professionally designed free PowerPoint templates.