I modified the template for the site. You can now link to wowhead.com using HTML and you'll get a mouse-over with the spell or item info.
Aimed Shot (http://www.wowhead.com/?spell=19434)
<a href="http://www.wowhead.com/?item=28440">
Thunder</a>
[wowitem]28441[/wowitem]
You can use either html or the UBB item tag for items; use HTML for the spells. In this example, Thunder is using HTML and Deep Thunder is using the UBB code. The UBB code will query Allakhazam, HTML will query Wowhead.