iStumbler is the leading wireless discovery tool for Mac OS X, providing plugins for finding AirPort networks, Bluetooth devices and Bonjour services with your Mac.
At home and away, keep your valuable documents safe with powerful AES-128 encryption. FileVault automatically encrypts and decrypts the contents of your home directory on the fly.
Automatic allows you to set up subscriptions for virtually any content linked in RSS feeds: podcasts, videocasts, torrentcasts... Rule of thumb: if it ends in '-cast', you can get it with Automatic.