Probably not as secure as it ought to be. This Lifehacker post discusses how to hack weak passwords. if you don’t already use an application to securely store your passwords (and you should have multiples – don’t use the same password for everything!), two apps the author recommends are RoboForm or KeePass for Windows or Mac users, and he also recommends 1Password for Mac users (and I can second that recommendation – I use 1Password and wouldn’t leave home without it – well, actually, I don’t think I COULD leave home without it as it’s on my computer and my iPhone!).