I doesn't seem to have changed. I meant to have the pop-ups/previews only when you hover over the actual blue link and not when your mouse goes over the whole grey box background around the link. That way the user hovers over the link and can preview it before clicking without having the pop-ups everywhere.

The pop-ups seem to come up in the same place and if one comes up before another, which is a problem caused by having the pop-ups come up when you go anywhere near the grey bar, it becomes difficult to know which pop-up is for which link. Personally, I would have the user hover over the blue link, then have the grey background box come up as a sort of guide for the eye to follow towards the pop-up, and have the pop-up surrounded with the grey background box as well (at the minute it has no background 'frame'). This way you guide the user from the link to the pop-up and they know exactly which pop-up relates to the link.

Also, I would reduce the size of the tag cloud. I just searched for Adobe AIR and the cloud was huge. Perhaps have the top/most occuring tags and the ability to expand the cloud if you want to.