From Amnesty International, a handy fact sheet on the death penalty.
Here's a snippet:
[A]t least 3,400 people were executed in China during , although the true figures were believed to be much higher. In March 2004 a delegate at the National People's Congress said that "nearly 10,000" people are executed per year in China.
Iran executed at least 159 people, and Viet Nam at least 64. There were 59 executions in the USA, down from 65 in 2003. ...
[In the US] more than 3,400 prisoners were under sentence of death as of 1 January 2005.