This isn't as important to those already in a guild that uses guildportal, but this could be very useful for guildless people that are looking for guilds to join. If someone visits this site that does not have an active guild, they may be able to search for a guild that they've heard of, but what if they don't really know the guilds on their server? What if they can't remember how to correctly spell the name of the guild they're looking for?

I believe a selectable listing of guilds by game/server would be of benefit to unguilded peoples that do not yet use guildportal, as well as for new members trying to subscribe to their guilds guildportal website.