Apple has released Server Admin Tools 10.7.5, which includes updates to its set of administration applications for use with Mac OS X 10.7 Lion Server. In particular, the Server Admin and System Image Utility tools add NetBoot/NetInstall model filters for MacBook Pro and MacBook Air (Mid 2012) models. Additionally, the System Image Utility improves reliability of booting from NetRestore images, and the Workgroup Manager correctly sets the password expiration date for Open Directory users and shows the names of members of Active Directory groups. (Free, 195.67 MB, release notes)
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.