Here's bookmarking sites with a PR5 and higher:

1. http://del.icio.us - PR8
2. http://www.furl.net - PR8
3. http://www.connotea.org - PR7
4. http://www.blinklist.com - PR6
5. http://de.lirio.us - PR6
6. http://www.netvouz.com - PR6
7. http://www.spurl.net - PR6
8. http://www.backflip.com - PR6
9. http://blogmarks.net - PR6
10. http://buddymarks.com - PR6
11. http://www.clipfire.com - PR6
12. http://www.citeulike.org - PR6
13. http://www.feedmarker.com - PR6
14. http://frassle.net - PR6
15. http://www.jots.com - PR6
16. http://www.linkroll.com - PR6
17. http://maple.nu - PR6
18. http://www.kmfavorites.com - PR5
19. http://www.linkagogo.com/go/Home - PR5
20. http://unalog.com - PR5
21. http://www.bookmarktracker.com - PR5
22. https//www.chipmark.com - PR5
23. http://www.feedalley.com - PR5
24. http://gnafi.com - PR5
25. http://www.igooi.com - PR5
26. http://www.lookupthis.com - PR5 T
27. http://www.mybookmarkmanager.com- PR5
28. http://www.mylinkvault.com - PR5
29. http://www.myhq.com - PR5
30. http://www.myvmarks.com - PR5
31. http://www.openbm.de - PR5
32. http://tags.library.upenn.edu - PR5