Additional Polar Tracking Angles

You can set additional polar tracking angles (besides the default horizontal/vertical). Just right-click on the POLAR button in the tray (next to ORTHO and OSNAP) and select "Settings". You can either pick a standard increment from the drop-down menu, or check "Additional angles" and add your own. This is great for a building with a wing at a different angle, for example, but be selective -- too many angles active at once can make it hard to pick the right one.