Xiayan suggested I share some useful tools I shared with him on my blog. So here you go:
Dropbox – File sharing/synchronization, online storage tool. Extremely useful for people with multiple computers and files to be shared between them.
Macheist – Mac Community that raise funds for charity and give you lots of great Mac Ware at amazing prices (sometimes free too).
Lifehacker.com – Life-hacking tips and recommendations, a must-read-frequently site for GTD enthusiast.
Growl – Mac Notification tool, it’s basically an alert programme that seamlessly integrate with your mac and several other popular programmes.