These are a few widgets I have stumbled across that might come in handy for your shoot!
Sun Position lets you input any location, time and date and kicks you out the suns position!
Weatherbug is a pretty complete weather widget with windspeed and access to local webcams to take a quick look.
Film Calculator Widget
We designed this up for our clients that are on the Mac OS. It allows you to input footage-frame rate-film type and amount of tape needed.
Not a cool widget but well worth seeing. "Destino" is a incredible collaboration between Roy Disney & Salvador Dali. I saw the full work @ the LACMA and it is worth the trip.