(click map to enlarge)
Some interesting tidbits…
The ten states with the highest sales tax rates (from highest to lowest) are: Tennessee, California, Arizona, Louisiana, Washington, New York, Oklahoma, Illinois, Arkansas, and Alabama.
At the other end of the spectrum, Delaware, New Hampshire, Montana, and Oregon have no state sales tax. Interestingly, New Hampshire also has no state income tax, though it does tax investment income along with inheritance, business income, etc.
Please note that the above map includes local sales taxes (city, county, and municipal) as a weighted average based on population numbers, so the numbers might not match up exactly with the rates that you pay.