Windows only: Notepad clone Nocs looks and feels just like the regular Windows utility, but instead of editing local files, it can save and edit text notes directly to your Google Docs account.
Once you've downloaded, installed the utility and entered your Google account information, you'll be able to create text notes and save them directly to Google Docs. The notes can be encrypted by flipping a switch in the preferences, and you can switch from one account to another easily.
The only real problem is that the notes are stored on the Google Docs side in a single spreadsheet, and not in human-readable format — but if you are looking for a way to quickly store and retrieve notes that can be accessed from any computer (with Nocs installed), this might be worth a look. Nocs is free and open source, available for Windows only.