I've seen several interesting charts about the impact of tax rates on the economy, but I'm generally frustrated with the small amounts of data presented, so I looked up the source data on revenues, real GDP growth, and top tax rates to make a sweet chart. On a related note, here's a post about the Reagan tax increases that Republicans should read.
Now onto the good stuff. Below are reproductions of the charts (in order of information density) from the "several interesting charts" links, as well as the one I made myself. If you're curious about how some economists interpret this data, read the source posts.
Large interactive version of my chart is here.
Small static image below: