Dublin Crime Mashup:
This new Google Maps mashup maps all homicides in Dublin, Ireland from 2004 onwards. Rather than mashing up with a database of crimes it uses news reports as its primary data source. Geo developer Matthew Sammon explains that crime stats in Dublin are very "coarse-grained". He goes on to mention that other types of crime may be added in the future. Other Crime and Sex Offender mashups can be found here..
Patients awaiting hospital admission - Figures are from April 2005 to April 2006 for hospitals in Ireland. [Via ProgrammableWeb]
Other Previously Mentioned Mashups:
DartMaps - Live locations of Dublin commuter trains!
Daft.ie - Ireland property search on Google Maps
A good list of other Irish Google Maps mashups
Nearby.org.uk - Google Maps mashup with many websites with data for Ireland
The Bono Probability Positioning System - Read my post about the Google Maps tool that will help you find the U2 star! :)
Sightseeing with Google Maps: Ireland