My 721 still shows all purchased (and reported) PPV movies that I have purchased for more than the past year. There doesn't appear to be any way to manually clear them. The 721 appears to store them on the HD, and doesn't have any memory problems with keeping the infor forever. I have never cleared the caller ID on the receiver either, and it contains a listing of every call I received sincd May 2003.
One note of interest. I crashed my 721 in May of 2003 by turning off/on the power at the house circuit panel several times while the 721 was trying to reboot (I forgot the 721 was plugged into the circuit). When I found the 721, both lights on the front were blinking. I powered it off, and it indicated the sofware was corrupt and promptly (well slowly) downloaded new software from the sattellite. When the system reload finished, I had lost all of my personal settings, all of my recorded programs, and all of the PPV movie listings and caller ID history. The receiver has worked fine ever since. I don't recommend doing the rapid power cycle to your receiver though...
- Paul