What is Google Voice?

You've probably heard about Google's online phone service. But do you really know what it is, how it works, and why you might want to consider it? Chris Pepper has some answers.

Meerkat digs SSH tunnels

Meerkat takes some of the pain out of creating SSH tunnels, making it easier to make secure connections between computers.

Mac Security: Firewalls

OS X has not just one, but two, firewalls built in. So when, if ever, do you need a third-party firewall program? Chris Pepper and Rich Mogull explain.

Review: NetBarrier X5

Intego's NetBarrier X5 looks like a nice alternative to OS X's built-in firewall. But its tendency to block legitimate network traffic could make it a poor choice for home users.