While looking for gift ideas for nieces and nephews I came across the Uber Review and their 12 coolest Toys of the Year.http://www.uberreview.com/2007/11/the-top-12-coolest-toys-on-the-planet.htm Just when I was beginning to think that video games were taking all of the fame these made the list. Some are a bit pricey but maybe they'll give you ideas of something you could do on a smaller scale. From the look of some of them you might have a hard time prying Dad away from them long enough to let Jr. try them out.
Anyhow... check out the list. Hope you find it as interesting as I did!