Cute and informative diagram (yet not directly linkable):
www.eff.org
Bonus tip - If you use obfsproxy (alpha stage at the moment) you will "hide" that you are using Tor.
How HTTPS and Tor Work Together to Protect Your Anonymity and Privacy
Click the "Tor" button to see what data is visible to eavesdroppers when you're using Tor. The button will turn green to indicate that Tor is on. Click the "HTTPS" button to see what data is visible to eavesdroppers when you're using HTTPS. The button will turn green to indicate that HTTPS is on....
Bonus tip - If you use obfsproxy (alpha stage at the moment) you will "hide" that you are using Tor.