Using Twitter as I do, and just generally being exposed to all sorts of sites in all sorts of places, I come across some really good ones from time to time, so here are a few I that come to mind:
Here's a recreated added bonus.
anyone can edit, is a must. Fields supplied include: web, blog, Twitter, VoIP and IM. It's also possible to add your QR code as well as your Google Street View link plus widgets and it includes bidgets (for export to other sites). Brownbook.net has to be the coolest business directory ever!