Are any of these actually interactive with the functions shown or is it just a display? I'm currently rocking some Geektools on my Macbook displaying stuff like real-time weather/several separate timezones from work etc (all achieved using AppleScript + Curl).
They're interactive. You can actually make them do whatever function you want. For example, I did have an email feed in which I could click on the email to read it. It updated as I received the emails as well (well, it just refreshed my inbox every min).