Normally webmaster submit their sites to directories for Link building and PR..

Web Directory hardly delivers direct traffic to site..

If your site is submitted in 1000 free directory, can can get average of 10-20 traffic daily

i guess, you should pay for the directories which are managed and edited by humans, as they pay personal attention to each listing.
I have a webdirectory where i pay attention towards each listings's traffic and requirements.

__________________

I will also do the directory submission work just for PR and banklinks. I will rather do other promotional works like submitting to various social networks like stumbleupon and myspace to bring in some free traffic.

IMO, for PR and for traffic as well. having your backlinks at high PR directories will help in building your PR. Traffic from directories tend to be targeted and these type of traffic has the highest percentage of conversion from my experience.

__________________
PR4 Link Directory
Website Uptime Monitoring

i´m always looking for traffic and i dont care about pr

i am doing for pr as well as backlinks, for paid blogging traffic is less important than PR

__________________
Free Humour | Spicy Tastes

yeah, the most important is backlinks. more backlinks, more PR and more traffic

For both because it depends on one another.

.SR

Directories can help with anchor text and to rank certain key phrases and also provide backlinks. Directory submission is more beneficial for new sites that have no backlinks yet and pages that are trying to rank well for long tail keywords

__________________
Yurts builders and hire service == Free Directory Script

PR and backlinks.....I've never received much traffic from a majority of directories