Last year I open sourced my enhancement to Python PDB which lets you rewind time. Sadly I announced it on April Fools Day. Oddly enough, even though I open sourced it, people thought the screencast was a hoax. It isn't at all. It really works.
Check out last year's post:
This is really pretty cool! If I used python more, I'm sure I'd use it every day. Thank you for sharing, again. :)
I'm a little curious why you chose to blog about it again (almost) on April Fool's again, if you want people to take it seriously. I do agree that more folks should look at it, but posting about it only around the time that some people refuse to click unknown links seems a bit counterproductive for adoption.