For me too. 🙂
Based on my experience, some important tips for anyone undertaking this:
1. You need to remove the back panel, the battery (large black item), the sound module (long black item to the side of the battery) and undo the hard drive cage. All are secured with small Philips-head screws. Take care when removing the multi-wire connector that connects the battery to the motherboard.
2. Be VERY careful to take note of where each screw came from. There are long,
medium and short screws which hold the back panel, battery, hard drive tray and sound module respectively, all of which you need to remove and put back in the right place (which is not always obvious)!
3. There is a hidden screw for the hard drive under a cable, at the side of the drive closest to the middle of the machine. You need to remove that (and the others holding the drive down) in order to lift the black plastic tab that ensures that the sound cable remains connected.
4. Once your machine restarts (now with sound!) you'll have lost the clock (due to removing the battery). Open the Date & Time control panel, check 'Set Date & Time Automatically' and restart the machine again, and all will be well.
Other than that, it's not such a painful procedure, so if your machine is out of warranty, don't be scared to just order the replacement part and do a DIY install.
Please email if any questions: pjdixon at MobileMe.
Good luck all!
Phil