TiVo announces dual tuner support in version 2.5 of its software. Note that so far this only applies to DirecTV TiVo units. While no specific date has been mentioned, there are high confidence reports that it will be out very soon. "All new DIRECTV TiVo combination receivers will be provided with the upgrade automatically after activation of their TiVo and DIRECTV services." Some satelite TV resellers are already advertising the dual tuner feature as built into the unit.
The Slashdot thread has some interesting, if dubious, information. One post mentions that standalone TiVos will get the dual tuner upgrade eventually. Also funny to see how many think that TiVo ought to be commercializing the silly hacks everyone has done to their boxes. (See the TiVo Web Project.)
(Jeez, my links are stale!) A new DirecTV TiVo should be arriving at my door today. Can't wait!