Re: Disneyland Advice
Beware of cut-rate ticket outlets that sell actual but partially-used tickets outside the parks. Disney sells tickets for a certain number of days (or yearly passes). Some places will buy 7-day tickets from people that have only been used for, say, 5 days - and in turn try to sell it to you as a valid 2-day ticket. The practice is shady and illegal (at least it is here), but worse-yet the tickets are probably invalid. Disney uses finger-print readers to tie the tickets to the guest, and when they're not matched up you'll start to run into trouble. Occasionally the cast-member manning the turnstile may reset the pass, but at best it's a gamble.
The best legitimate ticket deals are usually through AAA and/or occasionally through a travel company that may be able to work a package deal for tickets and lodging. Unless you have a good reason for it, skipping the "parkhopper" option will save you lots of money on each ticket; the parkhopper option lets you go between DL and California-Adventure on a single day but it costs extra. Over multiple-days it can add up <span style="font-style: italic">plenty</span>.
MouseSavers is a good source of information,
Dad's Guide to WDW is about the Florida parks but the same general rules (where/how to buy and where not to) apply.
This is an example of what <span style="font-style: italic">not</span> to do.
Google is your friend here too, there is absolutely no shortage of detailed information on every aspect of Disney parks.