We planned our trip from Australia to Disneyland last year entirely via the internet and one guidebook.
The guidebook was "the unofficial guide to Disneyland" which gives you brilliantly detailed information on every ride, when best to go, how suitable rides are for various age groups, where to eat, how to hire strollers etc - everything you need.
Great websites are:
- this one (of course) for that first hand personal touch you can only get from those who live there or have been to Disneyland
- Mouseplanet.com, which, amongst others, has good info on ride closures and some good savings on room rates.
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http://www.scottware.com.au/theme/feature/crowds.htm has great graphs on crowd patterns during the year, and at various times of the week and day, as well as weather.
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www.tripadvisor.com for invaluable first hand reviews of hotels
- The Disneyland website has good information and is a good place to buy tickets.
- Weather.com has forecasts up to 10 days out, and climate average for the year to help you plan clothing.