jonathan w. summarized it quite well:
1. using a laptop gives you the advantage to go through the pictures and to store them.
2. take at least two 1GB cards with you, since you might shoot more then the 160 odd pictures during the day which fit on one card. I use LEXARs CF cards, have no experience with the icrodrives, but personally think that any mechanical equipment with moving parts is prone to be damaged earlier then a CFcard.
3. you might also want to use an external harddisk, 2.5" is way smaller and lighter then the bulkier 3.5" drives, the bigger the better, especially since the price of roughly 3US$ per GB is the same for 30, 40, 60 or 80GB drives.
the only thing to be aware of is that eventhough the case is quite robust you can end up crashing the disk if you drop it. happened to me once but I was lucky enough to get it replaced. anyways since then I end up wrapping the case in rubber bands... YES go ahead and laugh
4. if your laptop doesn't have a USB 2.0 or a Firewire, make sure you get a PCMCIA adapter since it really makes a huge difference in writing/reading speed.
you really do not need an exta AC/DCadapter for the drive since most of the cases come with the possibility of charging through a second USB plug.
5. don't forget to have fun!!