It's hard to understand exactly what Alexa ratings translate into in terms of hits, unique visitors, etc. Here's some random data heard from around the web.

Wordpress.com does 4.2 MM hits a day in April 2006, 1600 rank

Steve Pavlina http://www.stevepavlina.com/blog/2006/05/how-to-make-money-from-your-blog/ 1.1 MM visitors, 2.4 MM views April 2006

plentyoffish.com - 1000 rank - 14M pageviews/day - http://www.webpublishingblog.com/exclusive-interview-with-plentyoffishcom-creator-and-owner-markus-frind.htm

plentyoffish.com #2 - 700 rank - 19-20M pageviews/day - http://webmasterradio.fm/episodes/index.php?showId=43 (episode from 6/27/2006)

Marshall Brain?
rank of 15000 == 150K pageviews / day
rank of 2000 == 2.5 MM pageviews / day

digg - 5MM pageviews per day == ~500-1000 rank on Alexa, January 2006