Suggestion: drag page when moving mouse while holding down mouse button
Moving the mouse while holding the button down currently has no assigned purpose in IE7. In the Acrobat PDF viewer (and other viewers such as Google Earth, Virtual Earth, etc) this drags the "page" as the mouse moves. IE should do the same. Besides compatibility with other viewers, this allows for less mouse movement (i.e. looking for the elivator in the scroll bar) to move up/down as you read text (or taking your hand off the mouse to find the page-up/down buttons.)
Not everyone has a "wheel mouse". I'm using a Versapoint RF wireless keyboard to type this on a full screen IE7 showing on a large screen HDTV driven by Vista. The "rocker" mouse built into this keyboard is slow at going over to the scroll bar (and it is not all that easy to see on the TV)... I can increase the text size to make it easy to read/type text, but the scroll bar does not increase in size correspondingly).