City Improvements UI - It's hard to look at the list of city improvements as someone who's unfamiliar with the buildings and find the one I want. Most icons are a house with different kinds of paraphernalia around them, so they're not very distinctive. I have to hover over the whole lot to find what I'm looking for. Consider 2 solutions. More distinctive icons, or a toggle for adding a short-form name to the icons
City Improvements UI - Add a set of filter tabs so I can shortcut to a list of food producing buildings, material producing, housing, etc. This will help a lot as the list of available improvements grows
City Improvement Queue - This idea is straight from Supreme Commander. Let us schedule buildings that we cannot currently afford. When the requirements are met, they'll get queued. It'll be a bit of a planning nightmare if you go nuts with it but it can let you set a plan for a city when you first establish it so you don't forget what you wanted to do.
Windowed mode bug - I usually can't click on minimize, maximize, close buttons in the window unless I move focus to another program or the desktop first.
Unit placement bug - I've noticed some units being positioned improperly sometimes. It may have to do with zooming in and out between cloth map and 3d map, or with 3d terrain involved. I'm not sure which.
Elementalpedia - Just copy the civilopedia for in-game reference 
There's a real lack of usability information right now.
These were the thoughts I had last night during my first play session. I'll be sure to submit bug reports if I can figure out more solid steps for the bugs I saw.
