WeaKnees Blog has posted an update about doing the transfer of an old DirecTiVo lifetime subscription to a new Series3. The important bit is:
The word hasn’t spread too well among the TiVo operators, so it seems, but everyone who calls to do the transfer has made it work. If you’re going to try, you might ask your operator to reference article 090717. That should give them the info they need to process the transfer.
Remember, you must purchase the Series3 on or before 12/31/06 (that means just 4 days left!), and make the transfer on or before 1/31/07. So don’t wait too long to decide if you’re thinking about it.