Before I start getting a bunch of messages telling me that they're broke... I've removed the gamercards that appeared beside your posts. I've changed it to plain text and added slots for your PSN and Steam names in preparation for more users from those ecosystems. If you have one already, you can fill it in under your profile account settings if you wish.
This was basically the only option for adding these fields, as having 3 different cards would stretch the post far too much, and there really isn't any good solutions around for multi-platform cards. So if you really, really like the gamercards, you'll have to use it in your sig.
Protip: when filling in your Steam name, use the account name, not the display name, otherwise it will be hard for people to track you down.