you have need add your browser pr rank toolbar
you can try this : http://www.statscrop.com/
I find PageRanks.ca to be a helpful tool for this.
You don't need to type a captcha, and you can insert as many URLs as you would like - all at once, with one click.
It displays Google PR, Indexed Backlinks, and Alexa Traffic ranking for each domain you entered. It also offers one click website pinging, and free link building.
So you can literally type your domains, view their stats and perform SEO in a few clicks. Nice!
I use seotoolbar and rankchecker plugins for firefox.
You need to know your serp position or your page rank?
For page rank you , as mentioned, prchecker.info.
For serp position I will suggest Rank Tracker from SEO POWERSuite, you can use the free version for a few kw. If you are looking for more you can buy or look up for a cracked version...
If you know where to look is not so hard to find.. I will be glad to post a link but not sure if this is allowed.