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One thing to keep in mind is that rechargeable batteries have a fixed number of times they can be recharged. That isn't the total number of full recharges, it's the number of times you put it on the recharger, period. So recharging when 1 bar down uses up one of those recharges just as much as waiting until 3 bars are gone does.
That's one factor that manufacturers of these devices don't always make public. Some such batteries can be recharged 300 times, some 1000 times, some 800 times. Sometimes manufacturers will make it known, such as Canon did with the battery I have in my new point-and-shoot camera. It'll recharge 300 times, so I certainly won't be recharging it every day!
So if you can recharge the Sony Reader once a month or so, you'll get many years out of it before the battery won't accept a charge any more. If you recharge it once a week, you'll reduce that number of years by a factor of 4.
Since I haven't seen any longevity numbers on the Sony Reader battery, I'm working hard to recharge only once a month. Of course, whenever you attach it to a computer to delete books or load some more books, it uses up a recharge cycle and you can't do anything about it.
Which is another argument in favor of keeping a large number of books on the reader, to reduce the number of times you attach it to a computer via USB cable. Also it is in favor of using a memory card and simply copying files using a card reader/writer.
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