bought my PS3 on 10 Jan, 80GB... so far dun think need to upgrade yet... but i believe that will change very soon...
gonna change to 320GB if i ever gonna do so

it's tide to your PSN account i believe

i'm guessing actually, for online purchased contents, it has to belong to something and in this case i guess it'd be your PSN account.

now i'm a little confused.
can someone answer this?

if i've purchase a game via online store, will i be able to play it if i log into the same account on a different PS3?

or do the purchased games register to your PS3 and you can only play on that particular one PS3? (nakata101 i think the backup for upgrade stores and restores EVERYTHING from your original HDD to your new HDD)