These sites that show you domains about to be deleted are pretty interesting, but I somehow don't think you can really benifit from them. There are so many people out there who have scripts and robots that the exact milisecond the domain drops it automatically picks it up and buys for the user.
Besides, something tells me if a three letter domain is about to drop the registrar will but it immediaitly :P
Well, sometimes, domains may be reregistered by the owner at the last minute before it is truly "deleted" making backordering a waste of money. But that's just some cases.
it cand be used for ideeas of domains .. if you try to backorder it will cost you ... and it will cost you big .. it only pays if the domain is worth it ...
Most use it for ideeas .. if you guys check the list you will find that its huge