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Brotherhood of Lan explains it nicely.
but 2 things?
1, Depends on the PR of the page linking to you!
2, If you are a new site and have this many links pointing from single sites......watchout, they will get you.
Shak
(excuse my above comment if I have typed out of turn, but this IS 1 of the oldest tricks out there)
If Pagerank is Logarithmic base 7 (who knows? It's just what a few people mooted here) then those 15000 links should give the site a pagerank 8. There are about 15 outbound links on each page on the linking site. That would drop the pagerank just over one notch to pagerank 7.
Sorry for boring you guys, I just get a little over excited about dross sometimes :)....err, I think I'll go and put the kettle on.