It all depends on the registry and what they feel like doing.
Lately Network Solutions have been the worst offenders and there is really no way of knowing when and what they will drop.
Snapnames.com is a good monitoring service.
One way is if you dont think the owner wants to keep it and you really want it is to get them to register and transfer it to you as they should be able to reregister it even though its expired.
Jayson
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