Website of the Day!
Google PageRank Calculator
Google PageRank Calculator tells you the PageRank (importance) of any site on the web. This is helpful because the only other way to access PageRank info is to use the Google Toolbar with (gosh!) IE.
UPDATE: Teja, in the comments section of this post, points out other ways to access the Google PageRank info without using IE! Try this site or this site.
UPDATE: Matt, again in the comments section of this post, points out this Firefox toolbar that gives you all of this info: Google PageRank, Google Category, Alexa popularity ranking, Alexa incoming links, Alexa related links and backward links from Google, Yahoo! and MSN.
Also in the comments section of this post, Stephen W. writes:
I have a Firefox bookmark that points to "http://www.googlecommunity.com/scripts/pagerank.php?url=%s" with the keyword set as "pagerank." This way, I can type "pagerank theurlhere" and get the pagerank result, just as I type "google keyword" for my google search. Handy little tool.