You don't need many tools to do this, so have fun!
EDIT: And there's now another wooden USB drive Instructable out there so check that one out too!
Step 1: What You Need
You'll also need:
- a saw (the smaller and finer, the better)
- a chisel (if it's not sharp, check out my Instructable on sharpening!)
- drill (optional) - for the keyring hole