Phuzby will let you search your organisation's LDAP directory (such as Active Diretory, Novell eDirectory, or OpenLDAP) for the contact details of colleagues, customers, or suppliers. Phuzby can display a photo for each person, and can even read the telephone number out loud to help you dial it correctly. In fact, if your phone system supports TDMF tones, you can hold your handset near you PC's speaker and phuzby will dial the number for you.
Tunix is a set of tools used to generate small bootable Linux images. It can be used to learn how to roll your own distribution, or to port embedded systems. The basic release uses busybox and has a kernel with netfilter-enabled modules. A uclibc iptables binary is included, so you can roll your small firewall from a floppy.