Download 150+ PowerPoint templates for free from Microsoft
The goodies include everything from slide backgrounds to animated text effects and charts. There are eight categorized download sets in all -- and they're all provided free of charge! You can also preview each category (such as the combined picture and text effects) before you download.
As is usually the case with free templates, some of the stuff is a little bit on the cheesey side. There's still plenty of good content to be had, however, like the nice timeline slide in the header image.
If you have Silverlight installed, check out the freebies in action in a video clip suitably entitled "Everything in the video is a Powerpoint slide" after the break! You can download everything from this page.
Need some tips on creating an effective presentation? Check out our post highlighting 6 handy PowerPoint tips!