Apago's PDF Enhancer may not be the sort of utility every Mac user needs, but for certain professionals, it's a must-have for automating the creation, standardization, and optimization of PDF documents (we rely on it heavily for our Take Control ebooks). Version 3.5 offers faster processing speeds (key in a production environment), improved reliability, clean-up of scanned documents, AES security, and improved font and color handling. With version 3.5, Apago has slimmed the product line, dropping the Standard and Server editions to focus on the Professional and Advanced Server editions. ($349 (Professional)/$1,999 (Advanced Server) new, upgrade prices vary)
Wake On Demand in Snow Leopard
Putting your Mac to sleep saves power, but it also disrupts using your Mac as a file server, among other purposes. Wake on Demand in Snow Leopard works in conjunction with an Apple base station to continue announcing Bonjour services that the sleeping computer offers.
While the requirements for this feature are complex, eligible users can toggle this feature in the Energy Saver preference pane. It's labeled Wake on Network Access for computers that can be roused either via Wi-Fi or Ethernet; Wake on Ethernet Network Access or Wake on AirPort Network Access for wired- or wireless-only machines, respectively. Uncheck the box to disable this feature.