This is a great blog post on BNET that outlines the top 10 free tools for sales & marketing that can make a huge impact on your business if you do not have a full scale solution.
Not only does the blog post review each tool, but they also offer the downside and why it is free.
The #1 tool is mybrainshark.com, where you can create multi-media presentations that can be delivered on demand. We are just starting our first project with them and I am excited to see the results. Stay tuned, as they will be available on the site.