Collectors Series City Mugs:

The majority of all mugs still come in the style of the first series from 1994.They feature different motifs and colors, but they are easy to identify.

'97 States of Bean Mugs: 

Colorful motifs from several U.S. states.

'99 Series City Mugs for U.S.A. and Canada:

 Colored photos with typical images from over 30 American cities.

'99 Series State Mugs:

 Features four different mugs from California, Texas, New York, and Washington.

'02 Skyline Series:

 Not as colorful as other series, these mugs are easily identified by the special font in their design.

'04 City Scenes: 

Black-and-white pictures with landmarks from several cities in the United States and Canada.

'04 Art Deco Style:

Similar to the '04 City Scenes, these mugs feature an art deco style and were only released in four U.S. cities.(Flags, Iwo Jima, Statue of Liberty, Mt. Rushmore )

'05 Photo Series: 

Unique style motifs from the United Kingdom and Ireland.

1.Cardiff, Dublin,2.Edinburgh, 3.Ireland, 4.London (Hyde Park),5.London (Palace Gates), 6.London (Park Bench),7.London (Snowy), 8.London (St. Paul's)

'06 Architecture Series: 

Since 2006, these have been the standard mugs in the United States.

'07  Park Series:

These mugs feature motifs from several city parks and national parks in the United States and Canada.

'07 Park Series:

These mugs feature motifs from several city parks and national parks in the United States and Canada.

'08 Icon Series: 

These mugs are replacing the original City Mugs all over the World. Started in June 2008 in China (for the Olympic Games), now also spread to Singapore, America, New Zealand, Australia, Philippines. Other countries will follow soon.

Japan Series: 

A series of colorful mugs from several Japanese cities as well as one "Japan Country Mug" per year since 2002.

Asian Artsy Design Mugs:

 These mugs have intricate designs mainly from Japan, China, Taiwan, South Korea, Thailand, Indonesia, and the Philippines.

Coffee Origin Mugs: 

Dedicated to the countries and regions where Starbucks buys coffee beans, including places such as Guatemala and Sulawesi.

Mini Mugs: 

Smaller versions of some regular-sized mugs, and a typical size for a single espresso.

Special Edition:

Very rare,really expensive!

Data by http://en.wikibooks.org/wiki/Transwiki:Starbucks_City_Mug