Have you considered adding the ability to edit multiple alerts at once?

If I've added a large number of alerts at once, I find it very frustrating to have to go through and delete old ones or change some simple setting -- making them all used and new, for example, or changing the target price to the same amount for all of them -- manually. A menu at the top or to the side with a few basic options would be very helpful.

Also, the X in the corner of the box that pops up when you Zing something is a little small to click easily. I haven't had a problem, but it always takes me that extra second to make sure I have it.

Other than that, I love your site. Very clean, very easy to use. Wonderful idea!