Nor have I seen anything regarding this for 2007. And of course you're right about the major changes in the Access infrastructure.
Bottom line: If you code, which worked in 2003, does NOT work in 2007 then you're pretty much out of luck. This was always a major league kludge anyway, and many people had significant troubles with that technique (that is, if you mean hiding the Access application window).
I realize that doesn't really help much, but unfortunately it's the correct answer.