"What's Reselect and what does it do," an anonymous comment asked.
Let's say you've worked really hard to get a selection of an area around a complex path, then accidently deselected it. Reselect allows for the most recent selection to be reloaded, or reselected. Be careful though. It doesn't work after your image has been resized or if you've created a type layer after you've deselected.