Public Transportation - Beijing
I don't know how many billions of dollars it took, but Beijing now has a pretty decent public transport system. The bus system website especially rocks! you can use the website to figure out where you want to go, then figure out what bus lines will take you there based on where you're staying at. Click on the link below for the Chinese version, or if you're not ready yet, there's the English version when you get on the Chinese website.
the subway system is pretty good also. My problem with it is that there's no city map superimposed on the subway map, so you can figure out what stops correspond with the subway stops.