Here is my second suggestion:
Website-Game Integration
Some might consider this unnecessary or disadvantageous, but I think it would prove useful to a lot of players (I asked around in-game about this and got some approval at least). Those who have ever played Neverwinter Nights 1/2 online are likely familiar with the Buddy list, which can be viewed from nwn.bioware.com by logging in with your game account - it displays your Friends list and, where applicable, it shows who is playing where (server IP).
I think it would be nice to have a similar feature on the official Guild Wars websites, whereby you can log on with your game account to view your friends list and guild roster as they would appear in-game. If anyone is wondering what benefit this would be; I, myself, sometimes only log on to play with a certain friend or guildie. It can be a pain to launch the game and log in just to check who is online, whereas it would be much easier to check via the website. And, of course, this would mean you could check who is online from work/college/school without needing the game.
Anyway, I should best leave it at that. Opinions are welcome, obviously.
(Correct me if I'm wrong - like I said, I don't know too much about computers 
)