Originally Posted by
travelinmanS
Even if you no longer get stamps you should be printing out the little slips with your date of entry on it after you go through the automated machines. It eases the checking into hotel process immeasurably.
I have a stamp from ~5 months ago (I encountered a checkpoint without eChannel), which I show to hotels, if they ask, but most of the hotels I stay in know me quite well, and don't care.