Hi Napster,
I work for an SEO agency and we run a few other metrics against the sites, other than PR, before we approach them to place links on them.
Do you have a couple of sample sites that you could PM? Or even better PM me a list of them all?
The agency I work for looks after a lot of different customers across many niches so this is of serious interest to me and being able to categorize your 1000+ sites would make it easier for me and my colleagues to be able to contact you while we're link building.
Are the links renewable every 6/12 months? (So we can keep the same links on a long term basis).
Also do you accept in content links where we would write and provide you with unique, targeted content?
Cheers,
Stu.