These things are so cool. I bought 2 for our lab (cancer research etc) from CompGeeks last week, and all the other postdocs love the microscope. The stock lights are a little too dim for any resolution/contrast at 200X but are fine for kid stuff.
Here'sa link for how to modify it for better brightfield microscopy.
It doesn't compare to our $25,000 Zeiss Axiophot setup with epifluorescence etc but it's great for gross anatomy. Most things you'd use (in science) a dissecting scope for you could use this, and for about 1% of the cost, I'd guess.
The ones from Compgeeks were the QX3+ version, having the "+" means native support for Win2K and WinXP in the software.