1Password software 50% off until tonight

1Password is a convenient program that stores all your passwords in an encrypted file, so that you don't have to scrounge around for that Excel spreadsheet or post-it notes or other ways of remembering your passwords.  Thanks to the Macworld expo this week, 1Password's maker AgileBits is selling 1Password for 50% off for all versions of its software from Windows to Mac to iPhone versions.  You can purchase 1Password through various app stores at that price, or you can go directly to AgileBits and purchase it for 50% and then use code MacPowerUsers for an additional 20% off.  All versions should get a free upgrade to version 4.