The Growl Project has released Growl 2.0, a major update for the system-wide notification utility that brings compatibility with Notification Center in OS X 10.8 Mountain Lion. With this new release, you can set Growl to route all of its notifications through Notification Center (rather than use Growl’s standalone pop-up notifications). However, you’ll still find some apps (including Dropbox) using Growl’s notification system instead of forwarding to Notification Center due to the requirement that developers update their apps to the Growl 2.0 API. The update also adds support for Prowl and Boxcar, two utilities that enable you to receive notifications from your Mac on your iOS device. It also reportedly resolves the high CPU spikes and multiple crashes suffered by the previous version. ($3.99 new from the Mac App Store, free upgrade from previous Mac App Store versions, 6.1 MB)
Mac OS X Services in Snow Leopard
Mac OS X Services let one application supply its powers to another; for example, a Grab service helps TextEdit paste a screenshot into a document. Most users either don't know that Services exist, because they're in an obscure hierarchical menu (ApplicationName > Services), or they mostly don't use them because there are so many of them.
Snow Leopard makes it easier for the uninitiated to utilize this feature; only services appropriate to the current context appear. And in addition to the hierarchical menu, services are discoverable as custom contextual menu items - Control-click in a TextEdit document to access the Grab service, for instance.
In addition, the revamped Keyboard preference pane lets you manage services for the first time ever. You can enable and disable them, and even change their keyboard shortcuts.