tourguidemike.com is a very informative, fun to use vacation planner. I signed up recently as well. In fact, I was debating whether I should buy the new Passporter or, for about the same price, sign up to this service.
If you go to Mousesavers.com, there is a coupon for $2 off the price but if you join tourguidemike.com's newsletter you may get one for $3 off.
The planning is personalized, you actually type in the characteristics of your party, travel dates, select your interests, and out comes a bunch of articles with suggestions, ideas and even secret tips on getting around the parks.
Mike is a professional vacation planner, he merely decided to create a site and share his ideas there, but I expect to hear more about him and his innovative way to plan a Disney vacation in the future.
The reason why I like it more than any other planning tool is that being online, the information is updated on the spot. Nothing is outdated. It reduces the time you'd have to spend searching all over for updates. You do not need to drag a guide along, just print what you need. And you still get personalized service!
To me, it was well worth investing in for our vacation...