Yep is the best new software I’ve come across in a while. Yep is to PDFs on your Mac as iPhoto is to images and iTunes is to music – a well designed tool for managing large collections of PDFs. Yep can automatically load PDFs from your hard drive, search across them, tag them and let you assign tags with which to organize them. It also lets you move them around (something I wish iPhoto did) and export them to other viewers, e-mail and print.
Thanks to Shawn for pointing me to this.