This Instructable (my first) will show you how to add an external mic jack so you can plug a lapel or headset mic into the EyeToy camera (and many other webcams) to be heard more clearly.
If you have an EyeToy and still haven't installed it on your computer, see this instructable Turn-a-PS2-EyeToy-Camera-into-a-High-Quality-Webcam.
Step 1: Gather the supplies.
EyeToy (or other webcam with built-in mic)
Miniature mic cable
1/8" (3.5mm) switched phone jack (I used stereo)
Soldering iron with fine tip
Knife (you might need to trim the plastic)
Step 2: Open up.
Lift the back edge (where the screws were) and slide back a little to remove the bottom cover.
Step 3: Remove the board.
Step 4: Drill the case.
Center punch the mark and drill a 1/16" pilot hole. Then drill the hole with the 1/4" bit using light pressure. You don't want it to catch this close to the edge and break it out.
Test fit the jack in the hole and see if you need to trim out any ridges or ream out the hole if you mis-marked or mis-drilled.