Just checked - it seems it doesn't appear every time I load the site, therefore I missed it the first time. Try reloading the site a couple of times.

Exactly. I had to reload the page to see it. Once I tried it out, it seemed like a pretty cool idea. It just needs some smoother execution.

The reload was one thing and others have mentioned the confusion of the "try it" button. Maybe a "Try It" arrow pointing to that lower left corner would help? Then change the original "Try It" to "Sign Up".

Edit: To note that the overall site seems pretty cool! Keep going...

This really confused me too, I could only see the "Try it" button and presumed it would give me a demo. I am not seeing it at all on the front page but do get this error:

Error: $("#haas").offset() is null Source File: http://www.helpbubble.com/ Line: 33

Edit: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.15) Gecko/2009102814 Iceweasel/3.0.6 (Debian-3.0.6-3)

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0;) Timestamp: Sat, 27 Mar 2010 17:51:55 UTC

Message: 'offset().top' is null or not an object Line: 33 Char: 7 Code: 0 URI: http://www.helpbubble.com/

Your demo is less than obvious. I thought the help bubble was just your site's logo. The "Try It" button takes all the fame. You need an arrow pointing at the help bubble that says something to the effect, "This is the demo. Click this."