For those who are interested in utf8 urls, I found tons of interesting links here:

http://www.aims.co.il/blog/multi-lin...haracter-urls/
http://www.seroundtable.com/archives/015032.html
http://www.cre8asiteforums.com/forum...howtopic=55458
http://ekstreme.com/thingsofsorts/we...ing/arabic-seo
http://www.seobythesea.com/?p=946

I hope these help you in one or another way, and if you happen to write such plugin for SSU, dont forget to post it ^_^