Microsoft Support Site: Links to enhancements, templates, and tips. http://www.microsoft.com:80/office/powerpoint/default.aspPowerPoint Resources from A Bit Better: Lots of very solid help and links to sites with commercial and free PowerPoint resources and advice. http://www.bitbetter.com/powerlinks.htm
PowerPointers: Resources and advice. http://www.powerpointers.com/cliotools.htm
Resource Links from Jefferson County Schools (TN): Lots of useful links. http://208.183.128.3/tutorials/pptr/resources.html
Midge Frazel's PowerPoint Resources: Again, many useful links. http://midgefrazel.net/powerpoint.html
WebSiteEstates.com: Templates, resources, advice, and links. http://www.websiteestates.com/links.html
Presenter's University: Offers great resources for PowerPoint Presentations including design templates.
http://www.presentersuniversity.com/index.cfm