Here's a few, "I could solve this in a weekend" solutions:
* Write notes with vim and archive them with git. If using github, you get website publishing for free.
* Write notes with nano and automatically upload to S3 using inotify (Python: http://pyinotify.sourceforge.net)
* Write notes with emacs and mail() it to your gmail account.
* Write notes for future reminder (+dates) with ed. Via cron, parse the dates using GNU date, and mail() yourself a reminder.
If we are the target market, so few of us are willing to pay for the service.
Just my 2 cents...