I think Jose is asking about the My vbPad that is in the User Control Panel here on HTF. To me it looks like a notepad attached to your user profile, a place to jot things down so to speak. I've never used it so I don't really know what it's for.
vB is for vBulletin- which is the maker of the software which runs this forum. The little note pad they integrated into your personal account for whatever use you see fit, they called it vB pad. You can keep running notes on whatever...
vB Pad was written as a third party hack to vBulletin so that members could use this to copy and then store text they wanted to remember for a later date.