I just downloaded the optional firmware 2.43 and the system actually seems more resposive. Anyway, I booted up Gran Turismo 5 and was browsing around the options when I noticed something interesting: When you uncheck the "Disable Advanced Downloading" it asks you to "accept" or "decline"
In the past you used to get a warning message saying this feature would be enabled in a future firmware update. Well this message no longer pops up. I guess now we know what the firmware update did, possibly among other things.
BTW, the advanced downloading system allows for peer-to-peer content uploading for faster downloads of GT-TV purchases, much like the MGO Beta P2P download option.