Guild banks are inching closer and closer to reality. According to Enoyls in this thread, Blizzard initially planned to implement guild banks for the expansion, but that has been pushed to the back burner, and the banks will make their appearance in a post-expansion patch.
Sure, it is a little disappointing to hear that they were planned for the Burning Crusade but have since been pulled, but it is great news that they are very much on Blizzard's radar. The current system of storing items on alts works, but it is annoying...and wouldn't it be nice to have a guild bank everyone could send items to? Instead of having MiningBank or ShardVault alts?
What features would you like to see included in a guild bank? Should everyone in the guild be able to view it? Do any other MMORPGs have a well-implemented guild bank feature you'd like to see Blizzard copy?