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Scottyman
You'll find that the cache is different when there's a code.
eg. search?q=cache:4WVpEvImZFEC:www.yahoo.com is from the 'cache' link in the search results, while search?sourceid=navclient&q=cache:http%3A%2F%2Fwww.yahoo.com is from the Toolbar.
If I remember correctly, the 4WVpEvImZFEC version should continue to give the same results over time, while the version without the code will change as Google re-indexes the page.