We are hosting our own do-follow Pligg Network. We offer bookmarking services to 50 of our sites for as low as $2 per URL.
May I say that all the sites are PR0 and this offer is not really for those who are engrossed with PageRank. All sites however, are hosted in different IPs. No duplicate IPs.
3 review copies are available. For the review copy, I will bookmark 1 of your URL across the 50 sites for free.