I've had those things opened more times than I care to remember, so I'll take a crack at answering your questions.
1. The PRAM battery is a small pack of NiMH batteries mounted near the front of the main battery compartment, beneath the motherboard. It should barely be visible around the right edge of the board. The battery uses a very long cord that runs around to the front left of the motherboard, and plugs in right next to the RAM slot, beneath that metal shielding bit which must be removed to access it. Two screws are all that hold it in.
2. Those little wires you're talking about were installed at the factory to disable CardBus support. At least, on that board revision; some had different was to disable it. Supposedly there were issues with CardBus, mostly in software, and instead of working out the issues, Apple just had IBM turn it off. Desoldering or snipping those wires restores CardBus, and as long as you're running 8.0 (preferably 8.6 or above), it works just fine. I've never had problems with CardBus USB or networking cards, anyway.
1. The PRAM battery is a small pack of NiMH batteries mounted near the front of the main battery compartment, beneath the motherboard. It should barely be visible around the right edge of the board. The battery uses a very long cord that runs around to the front left of the motherboard, and plugs in right next to the RAM slot, beneath that metal shielding bit which must be removed to access it. Two screws are all that hold it in.
2. Those little wires you're talking about were installed at the factory to disable CardBus support. At least, on that board revision; some had different was to disable it. Supposedly there were issues with CardBus, mostly in software, and instead of working out the issues, Apple just had IBM turn it off. Desoldering or snipping those wires restores CardBus, and as long as you're running 8.0 (preferably 8.6 or above), it works just fine. I've never had problems with CardBus USB or networking cards, anyway.