I'm in publishing and I have family in publishing also, but I don't think advance (not advanced!) copies are all that great, truth be told. The covers are a plain color, there are still editing errors, and the typesetting hasn't yet been corrected - there are bizarre paragraph and page breaks.
That said, you pretty much have to know someone on the inside. Even then, you aren't going to get the most popular releases - the bigger the release, the more closely it is guarded.
Avatar - Isaac, my blue-fronted Amazon parrot. Adopted 9/7/07. Age 30 (my pet is older than me!)