Good quality toiletries (and I'm a bloke)
Shangri la Singapore has a smallish pool area. But they prepare your deck chair and when you are done they take away your towels etc. means there arent dozens of chairs "reserved" all day via towels being left in place. they come around with fresh watermelon on a hot day too.
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But what impressed me is that they have used universal power outlets by the bed and desk.
A small one that's not been mentioned already (in addition to many that have):
Television sets that have a sleep timer. I find that most hotel tv systems don't have such a simple function.
I despise the type that make you stick your finger in the bottle to get the stuff out! SYD Flounge is the same......great product, lousy delivery!
Other than that-
Separate shower
Over supply of towels
Plenty of bottled water
Cosy, inviting breakfast/dining room
Decent iron/board
24hr shoe shine service
Decent paper selection delivered to your room
Egg station