Ever since Apple introduced the new Magsafe connector to their portable line-up, there has been a big lack of accessories. This is because they will not license the Magsafe technology to third parties. This is a shame, because I think it is a fantastic feature.
FastMac have just introduced a new charger called U-Charge that does away with the problem. Instead of plugging directly into the laptop, you plug straight into the battery. It is very portable, and available for the PowerBook G3 Pismo, 12-inch iBook G3/G4, PowerBook G4 Alu, and the latest MacBook and MacBook Pro. Costing $69.95 it is well worth checking out.