Hi Jone! Disney vacation countdowns can be almost as fun as the trip itself and through the years, my family has had a blast coming up with different and unique ways to count down the days until our Disney vacations!
As far as an online method, I would recommend checking out myvacationcountdown.com. Here you will find loads of fun and colorful Disney-themed countdown tickers which can be customized and inserted into emails which could be a really fun way to share the fun with your precious grand kids! There's even an option to add the ticker to your desktop as a widget.
Something we like to do here in my household, is create a Countdown chain. We simply cut out rings from red, black, and yellow construction paper to make a traditional chain with each link numbered to correspond to the days remaining in our countdown. We then attach one end to Mickey, Minnie, or any one of our favorite plush Disney characters! When we reach the character, we know it's time to depart on our magical adventure!
Also, be sure to check out my best choice, the Disney site,
Disney Vacation Connection which will serve as a fun desktop message center containing and displaying all of your Disney vacation information and plenty of planning tips! Here you will also be able to create and download your very own Disney vacation. countdown clock.
Hope this gives you a few ideas! Have fun with it...You'll be in beautiful Walt Disney World before ya know it!