Rails - Jul 2006 - Tracking who is online and what they are doing (Digg Spy)

Dear all,

What would be the best way to track who is online? Should I just add a 
filter to all my controllers to track the last time each user commits an 
action? Then I can deduce that whoever is active in the last 5 mins is 
online.

Additionally, I can be more sophisticated and track the actual actions 
each user commits. So I can have features like Digg Spy.

Or is there an already pre-built modules/tutorials that I can follow.

Thank you,

Sharkie

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