IO540 :
What website has satellite rainfall data?
At
http://www.metoffice.com/aviation/
Register - its free and select 'rainfall radar'
Its every hour delayed by about 20 minutes, plus you can play an hourly animation ..... Great if their are CB's about or an approching front .....Its addictive even when I am not flying !
Also from above site - All the usual TAFs/METARS , 214s/215's, a useful 48 hour animated colour synoptic etc ...
Another very good site I also use is : (no registration)
http://www.phd.nl/aviation/wx/
For TAF's/METARS and some great synoptics (try the USAF colour synoptics for N Europe, these also show cloud cover and perciptiation).