Jon Udell's latest column sums up some important but often-overlooked strategies regarding IT security :
Add an encrypted password database
Use digital IDs to authenticate and encrypt
Encrypt mailbox access
Finally, consider using Groove, a collaborative tool whose value as a pure security solution is often overlooked. The preview edition is free and will encrypt all of your messages and documents, both on disk and on the wire, without requiring any PKI or S/MIME or SSL gymnastics.