I just checked everywhere (including Mousesavers.com) and don't see any information about Disney raising their ticket prices recently. (The last time ticket prices went up was in August of 2008, making a one-day adult ticket around $75, tax included)
I agree, it always pays to buy the longest length ticket you can afford -- your per-day costs go down dramatically once you invest in a 5-day pass and it can be as little as a dollar or two to add an additional day once you're in the 8-day range.
Another way to save is to sign up for
Mousesavers.com's free newsletter. In each month's newsletter, she provides a link to a special "subscriber's discount" at one of the ticket brokers -- usually it's Undercovertourist.com. That can save about $5 off most tickets and you can sometimes snag additional deals. Currently, UCT has deals where you get "extra days" added.
While I like to park hop, dropping that feature is also a money-saver -- but be careful of doing this in peak-seasons. You may find that you are "stuck" in a park that is wall-to-wall people. Being able to hop can make all the difference in your touring experience.
My favorite way to save is to get an annual pass. Not only do we tend to take longer trips every year, we also plan to take them in such a way as to get the most use out of those APs (and their accompanying discounts.) If we plan to go the second week in December in 2009, we take our next vacation the first week of December 2010.... all on the same AP.
Good luck to all looking for the best prices on tickets!
Eileen