However...
Apple supports 3" Discs in the original TiBooks only.
Only use odd shaped disks in tray system (Why the PowerMac will never be slot loading.)
Places like Fry's Electronics, Tiger Direct, and CDW sell "wrappers" for 3" discs, and even for the odd shaped discs so you can use them in slot loaders (including your car). I'd definately look into them.
BTW: The slot-loading vs 3" CD issue is what forced AOL to go back to 5" CDs 6 years ago. A class-action suit was brought against AOL for sending the 3" discs and people with slot loading drives (Read: mostly Compaq Users) stuck them in their drives, and got stuck, forcing repairs.
TEG