There were some Antec computer cases, where the wiring assembly in the
front is really only good enough for USB 1.1 . Antec was offering to
replace the assembly in the front, with one designed to do USB 2.0.
A fair number of computer case models were affected - there used to
be an Antec web page with a list of the cases, but it was soon removed.

You can get devices like this, that sit in a drive bay. A really well
designed one, might leave room for the disk drive as well.

Koutech KW-F7771-B FireWire 1394a + USB 2.0 Combo Internal Front Bay
http://www.newegg.com/Product/Product.aspx?Item=N82E16815104225

SILVERSTONE SST-FP32-S Aluminum USB/1394/Audio Panel ( Silver )
http://www.newegg.com/Product/Product.aspx?Item=N82E16813999355

The ideal USB adapter design should have a short section of loose wires
down near the motherboard header end. The cable is supposed to have a
controlled characteristic, and the longer the loose wire is, the less
controlled the result is.

http://estore.asus.com/images/14-000012222.JPG

USB adapter boards can have a few analog components on them for filtering.
There may be small resistors, capacitors, and inductors. In addition,
there could be a larger electrolytic, and the job of that capacitor,
is to filter the power, just as it goes to the USB device being plugged in.

While these docs aren't very exciting reading, they do cover a few
issues for computer design and USB on the faceplate. In fact, these
docs don't spell out all the mistakes they can make, when providing
USB front access.

  http://www.intel.com/technology/usb/download/usb2dg_r1_0.pdf
  http://www.usb.org/developers/whitepapers/power_delivery_motherboards.pdf

  This one covers FPIO connections for audio, Firewire, USB and so on.

  http://www.formfactors.org/developer/specs/fpio_design_guideline.pdf

There are a few variations as to how the 2x5 header on the motherboard
is wired. Sometimes, an adapter and a motherboard, don't exactly agree,
and then some wires have to be moved around.

http://www.frontx.com/cpx101_2.html

This shows how to move the wires around, on the adapter cable end.
There are delicate plastic tabs you lift with a hobby knife, to allow
the wire and pin to be backed out. The pin then snaps into place, when
you reinsert it.

http://www.frontx.com/head_con.html

HTH,
   Paul

Have they ever worked? I'm just asking as sometimes when you buy a
motherboard they they dont come will all the cables you need, even tho
your case may have two jacks in front.