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It seems like the combination of a somewhat dated Linksys WRT54G and the MacBook wasn't made in heaven. Every once in a while, I find something like this in my laptop's log files:

Jan 23 11:04:27 iCoaster kernel[0]:
 ath_reset: unable to reset hardware; hal status 3
Jan 23 11:04:28 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 1 (2412 Mhz)
Jan 23 11:04:29 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 6 (2437 Mhz)
Jan 23 11:04:30 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 11 (2462 Mhz)
Jan 23 11:04:30 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 7 (2442 Mhz)
Jan 23 11:04:30 iCoaster configd[50]:
 posting notification com.apple.system.config.network_change
Jan 23 11:04:32 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 13 (2472 Mhz)
Jan 23 11:04:33 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 52 (5260 Mhz)
Jan 23 11:04:34 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 56 (5280 Mhz)
Jan 23 11:04:35 iCoaster kernel[0]:
 ath_chan_set: unable to reset channel 60 (5300 Mhz)

These effects occur once or twice a week, and aren't really helpful in the middle of trying to work. Overall, this has the stink of a driver issue. Googling around shows that there have been dropped connection issues between Linksys routers and Apple wireless cards for a long time, without Apple coming up with a useful fix.

Update, 2008-02-13 -- the woes continue on MacOS 10.5.2. They seem strangely correlated to the presence of a "secure" ad-hoc network here which, I believe, is caused by some Philips entertainment electronics. The name is WASC-.....