Majestic SEO is the worlds biggest back links and anchor text index where you can get detailed reports about your competitors back links and anchor text.  The new index that was released is about sixty percent bigger then the previous one.  There have been over 52 billion web pages analyzed with 350 billion unique links.  The information is available in detailed reports and can also be downloaded into a csv file.  Majestic SEO also released a top 200 domain list.  Majestic SEO is also looking at adding fixed fee subscription plans in the comming months.

Majestic SEO Website
http://www.majesticseo.com

Top 200 Site List
http://www.majesticseo.com/research/top-world-domains-by-backlinks.php