I first ran into Jaxer a couple of days ago when doing the latest update for the Aptana plugin for Eclipse. I didn't give it much attention, other than getting upset at the ugly icon on the toolbar. Ok, it's not ugly as much as it is inconsistent. The last thing I want is another "feature" being shoved down my throat (like the Aptana messages — grrr).
*My sarcastic signature comments may confuse the unacquainted. John Resig has earned my respect because of his visionary work, most notably jQuery and lately with his excellent book.