Many tools and options have poorly written or even missing tooltips. These should be reviewed and addressed to ensure they're user friendly, helpful, and above all clear.
One suggestion when reviewing tooltips, is that we ensure no option uses the related name within the tooltip. For example, a (now fixed) tooltip that violated this was Brownian Motion. The tooltip read "Amount of Brownian Motion". No matter how simple, or how obvious a settings it, the tooltip should describe explicitly what it is. In this case the tooltip was reworked to read "Amount of random, erratic particle movement"
Tooltips to Address
Put any poor tooltips found in the WIKI here: http://wiki.blender.org/index.php/Dev:Ref/Proposals/UI/Tooltips