Most Web Designers are forced, to some degree, to be both creative and technical - having to be creative with how the interface will look and what supporting graphics to use, etc. At the same time, they need to make sure they WORK - there are some things that, no matter how cool they would be, are just not practical. And add on top of that the fact that many times you have to cut your designs up into validating XHTML/CSS/Graphics, etc... some times it's just not practical to do it all.
My company just created a Web site for these guys - WebChopShop - and we've used them a few times to turn our Web Designs into HTML and Graphics. Especially on a quick turnaround, some times you just need some help with that end of things.