What is it you want to encrypt? My Raquel Darrien collection, of course. (Do you leave yours unencrypted?) And some financial stuff. Files, not drives.
Okay. Well, if you want, Windows 2000 and XP Pro both have encrypting filesystems built right in. Totally transparent and pretty secure. Otherwise,
PGP 8 is still around and is the de facto standard - it's free for personal use.