Adam Pash at Lifehacker has excellent instructions on how to pair your iPhone to your MacBook, iBook or even Dell Inspiron.

Other cell phone hacks are available elsewhere, but note that with AT&T you have two choices. The cheap way, which may violate your terms of service, or the authorized way, which involves paying for tethering.

If you’re like most people you probably don’t think much about the security of your laptop. Sure, maybe you’ve got a Kensington lock. Maybe you’ve got virus protection and a spyware scanner. Maybe you’ve put a password on your screensaver and logout when you’re not at your desk.

But the data sitting on your hard drive — even when the power is off — is valuable.

Bruce Schneier has an article about using a two-tier PGP encryption system on Wired. He also suggests limiting the amount of data you store on your computer, in case someone walks off with it when you’re logged in.

Read it and use it.