I'll just list a few of my favorite places to chill as it seems we have similar tastes.
~La Fee Verte http://www.lafeevertecafe.com/
~The Whirling Dervish
It's a *goth* bar by default although all types of people hang out there. They do a particulary good industrial night on Sundays.
Very cool coffeehouse in the Marigny, on Touro and Royal. It's open 24 hours too.
If you need restaurant recommendations I'd gladly help. I work in the service industry.
Check out nolagoth.com, nola.com, bestofneworleans.com as well.
Check out nolagoth.com as well for club listings.