Me too - but the N900 needs to, or it will run flat :-).
fragos has the n810, which can go for days. Battery shelf life is likely to be much more of a limiting factor than the number of charge cycles. I really don't think you gain anything by charging it daily, unless it is running low.

Theoretically to get the most years out of the battery, you could maintain a charge level of 60-80%. In practice, this is only of interest in more expensive batteries.
If you have a spare laptop battery, it should be stored with a partial charge in a cool place.

I had a quick google for a cite on deep- vs frequent, didn't find much.