Free directories with PR5-9 and those that actually accept submissions are becoming increasingly rare. AddURL has a good collection of high PR directories. I tend to believe that an approved submission in PR1 directory is better than rejected submission in PR 8 directory ;-)
use directorycritic, and addurl.nu and check http://10000freedirectorylist.blogspot.com/ lots, of dir list here also
you can try http://seoandsemexpert.wordpress.com/2009/07/19/free-directory-list/ here is lot,s of dir list . i found in internet .
Rule number one - just submit to as many as possible. Directories with PR.1 will/can increase in rank so don't underestimate them. Nice list btw .
Thanks for the list - I wonder Hot Frog UK is not in there though? They accept free submissions and seem to add the link within a few days. BTW - Does anyone have a list of free UK directory sites? I am trying to persaude Google that one of our clients is in the UK (which they are) as they are refusing to index them for co.uk searches