This is a pretty cool site which maps the current location of darts on a google map.
It is worth noting that at this time of writing the site hasn’t been updated since April 2006.
This is taking realtime info of DART locations every 15minutes from the irish rail website.
Make sure you try actually clicking on one of the darts…
Pretty cool 
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they have one for the aircoach as well which is fantastic.. now we just need it on the buses.. where it would be of most use
Indeed. Unfortunately that aircoach one is only available for Internet Explorer :/