Dnscoop.com shows Google pagerank along with alexa PR, number of backlinks(searched in yahoo) and even a domain price for your domain name(it's not that accurate most of times though).
Like the others I'm guesing abit at your question but you might like to look at Rank Checker from Aaron Wall. http://tools.seobook.com/firefox/rank-checker/ Also as already adviced, get the google toolbar. Cheers Mike
If you want to good ranking your blog then you must be regular posting to the articles in your blogs. every posting would be in one week and also you need to make a high ranking's link for each post. thanks