[webmasterworld.com...]
Check out the current registrar. If the name is with a registrar that has partnered with one the auction houses none of the other auction houses will get a look in and you'll be wasting your time/money back ordering with them.
To be safe (and to correct what I said), where a domain is with a registrar who doesn't have an auction partner, and when it goes into Pending Delete state, bid at all the dropcatchers. And if your paranoid, then, even if the domain registrar has an auction partner, bid at all the dropcatchers.