Preview
Much more powerful than in Jaguar, Preview features useful new options. Live searching in PDF being one.
Type a few letters and before you even entered a word, you'll see where in the document these letters appear.
A list of all occurences of the expression makes it easy finding what you are looking for.
The ability to make text selections in PDF is now added in Panther.
Frédéric Latour, (http://latourfl.com) 2003