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Take a look at the following thread: [webmasterworld.com...]
and then please go ahead and download the toolbar. If you are serious about SEM, the toolbar is a MUST.
Secondly: You have the other option of going to the Google Directory (http://directory.google.com/) and seeing if that site is listed. If it is, it will show the pagerank to the left (nicely in comparison to everyone else in that same category). Downside however is that not all sites are in the directory, and always going to Google may distract from your casual browsing.