First off, I'd like to note that a PS2 release of a game is almost always accompanied by the original PSX logo in addition to the PS2 logo. What gives? It's not as if Resident Evil 4 is coming to the original system!
That said, it seems to me that Capcom's RE4 site hasn't been updated since the GC version, or maybe it has. I honestly can't tell except to note that the Enemies section is really, really lousy (they may have added a few entries; I don't remember these extra selections). The Chief is misnamed, and our apostrophe-happy US web team decided to slap an 's after "Novistador" ...when anybody who's played the game knows full well it's "Los Novistadores" ! Criminally slow transitions and a really annoying creak sound played over and over...you can view this monstrosity here,, of course.
Tecmo's site is a bit interesting. I had followed a link to the site via an article about an ancient poll on alternate versions of Ninja Gaiden, from 2000! Needless to say I was astounded that the poll is not there any longer, but what *is* there is an interesting soda machine.
Note: You can smack the soda machine! Mouse over to the left, and bring the cursor back onto the soda machine (onto the Ninja Gaiden Black logo) and it'll move over. Amusingly enough, you can keep doing this until the machine (and the whole image including the Fiend in the background) are completely off the page. View that here.
As much as I like that RE4 page (the creak grows on you after a while), it's no match for the offiical Castlevania page, which sports some pretty nifty design. This one's changed dramatically since the first version came out at least some months ago, and none of the various versions have been that bad, in truth...on the bad side, Konami's message board is predictibly awful, but that's always true, isn't it? Find it all here... Sadly, I don't know any nifty tricks for this one.