This is a great little rundown; I appreciate it, and I feel good hearing it, since it jives with what we've been doing for years. Before we go on vacation to a resort, we just run by the bank at home and get $100 worth of $5 bills and keep them in purse or pocket to give to the bell person or the housekeeper (per day). And I'm glad to hear it should be left with a note for them, because I've been doing that, too. I guess it's just common sense.
I've worked in hotels for...well, most of my working life. Regardless of how much the room costs, please, *please* tip the room attendant! Believe me, the one who cleans your toilet in a $350/night room probably isn't getting paid any more than the one doing it in the $26/night room. It's best to tip daily and leave it clearly marked for the room attendant. I generally leave $3 to $5 per day.
In general maid service is daily but most hotels don't change the linen every day anymore. There's often a card telling you about that hotel's 'Green' program and how to let them know whether you want the sheets changed or fresh towels.
Other than that, a couple of bucks if the doorman hails you a cab or gives you directions, a couple of bucks per bag for the bellperson, 15-20% for food and beverage and I have no idea how much for wine stewards or Maitre'D-types or a concierge (though I think that last is 10-15% of the total). While it used to be customary for finer hotels to insist that a bellperson accompany you to your room, that's not generally the case any longer.
Hope that helps!
Jan