jtara - 4:13 pm on Dec 19, 2007 (gmt 0)

You don't need flash to prevent prices from going up before checkout.

You just need to have a policy in place that the customer gets the price that was shown them at the start, and/or make sure to do a final price check before final checkout. I think the former would be better, because I can't imagine any customer being happy about getting a higher price just as they are about to finalize the sale.

I don't see anything about conventional forms that prevents this. (Perhaps with a little AJAX help.)

What is it out these forms that you feel is "more intuitive"?

Flash has not had universal uptake until very recently. And that's because of YouTube's popularization of the .flv video format. While Flash is now claimed to be installed on 97% of PCs, I'm not sure I buy that figure, especially when it comes to PCs installed in businesses. Indeed, it's share may now be dropping in that scenario for the reasons cited by another poster.

i.e. the reason for Flash's current popularity (use on popular video-sharing sites) is also a good reason not to install it in a business setting.