sleep deprivation
I think the longest period without sleep I've ever been through is about 55 hours... I had an afternoon flight from Amsterdam to Hong Kong which takes about 12 hours, walked around in Hong Kong for a good 15 hours, after that, took a plane to Sidney which takes another 8 hours or so. Arrived in Sydney in the morning (I think) and spend the entire day sightseeing. Might not be very long, but jet-lags sure can be a bitch.
iPod
My 80 gigs iPod arrived last week, I think it's brilliant. Every time I see it I just can't help but wanting to lick it.