Now I know there are bigger things to worry about in games development but this is a small feature I'd like to see re-introduced in Skyrim that was missing (or rather, much less noticable) from Oblivion but appeared in Morrowind..

Rain drops interacting with bodies of water.. causing small ripples during rain showers, that kind of thing. This alone made simply standing near a shoreline or on a bridge and just admiring the view much more enjoyable in Morrowind that it was in Oblivion (and indeed Morrowind became my substitute for a screensaver for a number of months!), despite the more scenic vistas available in the later game!

Bethesda, Please don't fail me and everyone else who enjoys immersing themselves in your game-worlds with Skyrim by missing this small but hugely noticable effect

The water did ripple when it rained on it in Oblivion.