@ Crabfoot, actually, they don't use 2 dates any more, they changed to a single drop date as of sometime last summer.
All domains drop on a single date which is the 92 day one, whereas before it might drop on 92 days or 99 days, depending on whether the domain had nameservers listed for it, something like that anyway, but they all drop on the latter 92 days now.
Edit
For example, a name with the renewal date of:
Renewal date: 02-Nov-2009
If it doesn't get renewed, that will drop today, February 2nd.