Just a quick heads-up really, but for those in the market for bike locks or concerned about how to secure your bike, this recent blog post at Ride On is worth a read. They take a look at various locks available in the Australian market place.
I have one that looks like the Vulcan VSL501 Ultimate 3000 key lock which is okay but heavy. Probably really should upgrade! Also related to this topic is bicycle insurance. Some insurance companies may imposed restrictions on the type of lock used.