Designers need to know that the stuff they throw at the programmers is feasible. That means they need to be able to make more than just pretty head-in-the-sky designs, but workable designs. It's the same in every multimedia field. The designers need to know what they can and can't do subject to the project/product actually being ready on time, and for that they need a little knowledge about capabilities. This is especially true in web development, since you just can't do some seemingly simple things that work in 'real' applications with web applications. Keep the two separate to your own detriment. Programmers who know better are the ones that don't always say 'yeah, we can do that'..

Glad to see I'm not the only one.

Hey, maybe, eventually, oneday... the net won't be filled with such pretty (useless) designs and sites?