I don’t know why anyone would need encryption at home *cough cough* but here’s a free one that looks pretty good 
And it has a Linux version too! Well, slap a bee suit on me and call me Mr. Rogers! Actually, let’s not…
TrueCrypt – Free Open-Source On-The-Fly Disk Encryption Software for Windows XP/2000 and Linux
- Creates a virtual encrypted disk within a file and mounts it as a real disk.
- Encrypts an entire hard disk partition or a device, such as USB flash drive.
- Encryption is automatic, real-time (on-the-fly) and transparent.
- Provides two levels of plausible deniability, in case an adversary forces you to reveal the password
(Thanks Mike)
My mac has done this outta the box for YEARS!
It’s also cried itself to sleep every night, wishing it was a PC
i said Mac, not MythTV box…