Met Eireann Sea Area Forecast - http://www.met.ie/forecasts/sea-area.asp

BBC Shipping Forecast - http://news.bbc.co.uk/weather/coast_and_sea/shipping_forecast/

Set up mobile access to wx info on your phone - http://www.met.ie/mobile/mobile.asp

Weather charts (1-3 days) - http://www.weathercharts.org/ukmomslp.htm

Weather charts (1-10 days) - http://www.ecmwf.int/en/forecasts/charts/medium/mean-sea-level-pressure-wind-speed-850-hpa-and-geopotential-500-hpa

Weather buoys - http://www.ndbc.noaa.gov/maps/United_Kingdom.shtml

Windfinder site -- http://www.windfinder.com/

XCWeather site - http://www.xcweather.co.uk

Easytide predictions (1-6 days) - http://easytide.ukho.gov.uk/EasyTide/EasyTide/SelectPort.aspx

ISA primary port tidal data in PDF format - http://www.sailing.ie/Racing/Tides.aspx

GRIB files viewer - http://grib.us/ (requires free registration and install)

Saildocs GRIB files via email - http://weather.mailasail.com/Franks-Weather/Home

Android Apps
GRIB files viewing app for Android phones - http://www.sailgrib.com/ (free and paid €4.99 version available)
Tide7 prediction app - http://www.tide7.co.uk/ (€1.68 covers UK and Ireland)

iPhone Apps