Is your goal when a domain gets deleted? GoDaddy offers alerts and it includes changes to the dns, renewal etc
However, if your goal is to monitor names that are going to expiring / pre-release auction, there is no tool like that now. The only way to do that properly is to monitor gd, namesilo, namejet, dropcatch pre-release and a lot of others. Expired-domains probably should build something like this as a premium feature, he has the data already.
Most good domains don't drop, if all you do is monitor drops, you will miss most.