You could use the OpenSRS Batch interface today to try to snag dropping names, however high frequency queries of this facitily is not encouraged either.
the prospect of a dropped name system offered by OpenSRS was discussed and put on hold back in February as I recall (search the discuss list archives).
Peter Ejtel is the manager responsible for the project at Tucows.
The problem is that the WLS will squash any efforts that anyone puts into a system at this time, so until the fate of WLS is determined, no one wants to invest the kind of money that a real dropped name system will require.
If the WLS is effectively blocked, I would guess we will see a dropped name service from OpenSRS available to resellers within a few months. I believe they were ready to actually start beta testing when they put the project on hold - as Verisign announced they were taking over the dropped name market once and for all...