Theres already a boat load of lists provided, so I`d recommend to sticking the high PR and be sure to focus on whats need more attention.
Nice list ! Submit your website in high quality social bookmarking site, it helps to increase website's traffic.
[TABLE="class: cms_table, width: 195"] [TR] [TD]reddit.com/[/TD] [/TR] [TR] [TD]technorati.com/[/TD] [/TR] [TR] [TD]digg.com[/TD] [/TR] [TR] [TD]choowawa.com[/TD] [/TR] [TR] [TD]multiply.com/[/TD] [/TR] [TR] [TD]rollyo.com[/TD] [/TR] [TR] [TD]folkd.com[/TD] [/TR] [TR] [TD]jumptags.com/[/TD] [/TR] [TR] [TD]dropjack.com/[/TD] [/TR] [TR] [TD]oneview.com[/TD] [/TR] [TR] [TD]kwoff.com[/TD] [/TR] [TR] [TD]url.org[/TD] [/TR] [TR] [TD]memotoo.com/[/TD] [/TR] [TR] [TD]designfloat.com[/TD] [/TR] [/TABLE]
You can get a better updated list on vmoptions.com. I always take directories & social bookmarking sites from that.