To rotate the camera, bump the mouse cursor against the left/right edges of the screen.
To zoom in/out place the mouse cursor at the top/bottom of the game window (the scroll button works too!).
To run instead of walk, click on your avatar, then Appearance/Run
To change camera angles, try the F5, F6, and F7 keys.
To send a private message, type ".playername message." To send to the same person again, type ". message"
To increase the size of the chat window left-click and hold the mouse button down anywhere in the chat window and drag up.