It’s not a small download, but all Apple says about the Lion Recovery Update is that it improves Lion Recovery and fixes a bug related to Find My Mac when using a firmware password. Hopefully you won’t have to rely on Lion Recovery, which enables you to perform some troubleshooting and to reinstall Lion by booting from a special hidden partition on your hard disk. Software Update is the easiest way to get and install this update. (Free, 431.91 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.
Lion Recovery Update
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