We get pretty good traffic at bug.gd. But hard to tell if it would be higher without the odd suffix. It helps that we encourage them to use our Firefox extension and/or bookmark the site when they visit (since people are rarely searching for errors when they hear about us).
They bought delicious.com a while ago, and their new version will eschew their trademark dots entirely (another good example of a company moving to a 'better' domain once they've established themselves).