Google ranking doesn't depend on your PR it depends upon your SEO efforts. And you can check the site position on google webmaster page.
WTH people if you dont know the answer they why bother posting???? here you can check your rank here http://www.kpmrs.com/
If you have too many keywords then you can use softwares such as IBP or WebCeo for checking the ranks.
The best way to check your rankings is Google Webmaster Tools, but, there are several other tools available like http://www.seocompany.ca/tool/serp-checker.php and http://link.ezer.com/tools/google_serps_rank_checker.asp
In my experience, Google webmaster tools has always been very far off from being accurate. Raven-seo-tools has a good weekly serp tracker and there a couple programs you can buy. I think SEO-TOOLS for firefox has a serp tracker also.
I have to agree with backlink...Check Google Webmaster Tools, it gives you over 100 keywords and there rankings.
To check your rankings in google, check out this useful tool: http://www.seoserp.com/web_tools/google_top_1000_serps_checker.asp It gives you your ranking for the top 1000 SERPS