Version 1.0.0 of the free Stress program has just been released. The test tool generates configurable loads for the CPU, memory, I/O and drives of Posix-compatible systems.
Even if you do not have a mail server of your own, SpamAssassin can help you filter out unsolicited junk mail. This article describes how SpamAssassin collaborates with Evolution and KMail. Thunderbird, on the other hand, has its own simple spam-detection feature.
If you follow the fortunes of large installation IT, tune in on November 12-14 for a front row ticket to the Invited Talks series of the USENIX LISA conference.