Measuring how many times another user's tweets are retweeted?

Hi,

Anyone got any idea how I can measure how many times another user’s tweets are retweeted?

Any input is greatly appreciated!

Thanks,
Nick

The Twitter advanced search tool will actually work for this (as long as it’s newer and twitter search is working) but you can find a variety of services that graph retweets

The top ten ReTweet measurement tools | The Tweasier Blog including Twitter Statistics, Twitter Reporting, Twitter apps and Twitter Software