
It's a painful bug. On occasion I open up the guide and everything (including a couple of channels) is missing. It's worse than the opportunistic scanning bug in Vista.
Anyway, in relation to movies, if you want some really good extra meta-data for movies like Similar Movies, Cast & Crew information and an extended synopsis, then you can change the registry key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Settings\MCE.GlobalSettings\systemGeoISO2
from Au to US. You'll then get additional information downloaded from AMG if the movie contains a Name (obviously it would) and a year that can be matched with the AMG database.
Sometimes Win7 will overwrite the registry key though (i think MCUpdate does it), so you need to keep an eye on it. There is a tool that can do this for you, and automatically change the key back to US when it's changed, but I don't know if I'm allowed to link to external software on this forum (I wrote the app, so I know there's nothing bad in it).