Empowered marketers are more productive marketers. That's why we like Unbounce, a tool that allows marketers to create, publish, and test landing pages without help from the IT group. You can try it for 30 days free. After that, plans range from $25-$500/month, depending on unique visitors/month and number of custom domains.
Thanks to Ryan Skinner of Velocity Partners for bringing our attention to Unbounce in a post he wrote about landing pages (check out his terrific slide show and list of additional resources).