heh well here's my free version
which took 5 minutes.. so fwiw..
frontpage of each site has: 19 links to other sites he owns
and ~499 links that go deeper to the root domain
On these ~500 pages he has links to 50/500 (so basically google goes to page follows 50links, finds a page with 50 more links etc)
and 19 links to other sites he owns.
One thing that I don't quite understand is how he got these pages crawled so quickly.. Maybe he has a high PR site that gets regularly crawling and fed it links into his matrix.