Pepsi went through numerous logo changes, originally starting out with a script style font for the letters in it. However, Pepsi has now settled with a 3D logo and sans-serif lettering below it.
There are a couple of font sets created to be similar to the font used in the current pepsi logo, and both can be found here. This one originates from a logo a little older, while this one reflects a more modern Pepsi font.
To learn more about the Pepsi globe and it's lettering, check out the Wikipedia article here.