I find startup ideas by looking at the domain names which are expiring and are in the pendingDelete status. I acquired lots of these and for some I am writing down what can be done for it.
When you start a startup it’s good to have a good domain name right away - just ask Mint.com how much they had to give up for that good domain name (gave up some good equity) - or ask Facebook, which paid $200,000 for it after it became successful (money which could be used for the actual business)