(This tip was posted a few days ago over on CADing & Coding, and I thought it was worth repeating.) When editing block attributes, you can drag-and-drop text between fields (not just within them). Say you enter information on the wrong line – just highlight it with the mouse and click-and-drag it to the right field. This tip is especially for LT users, since it doesn't work with the Enhanced Attribute Editor. There you still have to cut & paste.