Where can I find the list of the Keyboard Shortcuts for the IDE and what they do?
The new IDE based on the Slate UI which is used to make the world editor is coming out this week so we'll make sure to provide a hotkey list for that.
Until then the best thing to do is to look at the menu options and right click on things to see the context menus. They should describe the keyboard shortcuts. [Of course a handy list will be even nicer.]