Dammit, MichaelD, you beat me to it!
I was going to do that exact same thing for myself, using the slot headers that came with my KT7-RAID. If you're still planning on doing it, here's an idea that you may want to consider while doing it...
In addition to cutting holes in the plastic bay cover for the USB header, I'm also going to drill four 1/4" holes... one for each of my SB Live inputs (front and rear speakers, line in, and mic). Then I'm taking speaker extension wires and attaching them to the back of the bay cover so the connectors line up with the holes (same way as with the USB). Then I'll take the wires along the bottom of my case and out the bottom PCI slot opening, and plug them in to the soundcard inputs there. Then, all in one bay, I'll have 2 USB inputs and all of my sound inputs (which is great for me, since I interchange speakers and headphones all the time).
I know this is like the FrontX, and for some people it may be less expensive to just buy that. But for me, I already have the USB header, the plastic bay cover, and 2 of the 4 speaker extension wires that I'll need (the other two will be about $2 each). So instead of paying $25 for the FrontX and another $10 when the USB add-ons are released, I'll be able to build the same thing for about $4.
Just a little something for MichaelD (and anyone else out there interested in frontal inputs)!
WAZ