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)