Seconding snapnames.com. I've been using it since 2007 to grab interesting domains when they expire. You can place bids on registered domains and they just wa

Seconding snapnames.com. I've been using it since 2007 to grab interesting domains when they expire. You can place bids on registered domains and they just wait until the domain expires. My favorite thing is to track acquisitions of companies with interesting domain names and bid on them. Inevitably the acquiring company stops using the domain and lets it expire.