Well, it's not really that serious, but we can do some pretty cool things with tooltips in Infrastructure Modeler, if you haven't tried it yet.
One of the principles behind our ability to hyperlink to data or to display dynamic information in tooltips was that we had a ton of customer feedback that said we would need to give customers the ability to access enterprise data to generate reports and visuals. For our first release of Infrastructure Modeler, this boiled down to giving access to a really nice scripting engine and then really pushing the limits on tooltips within a desktop product.
Take a look at the followign example:
<tooltip>
<forcewebview>true</forcewebview>
<style>
background-color: white;
max-width:400;
max-height:350;
border-color:black;
border-width:1;
border-style:solid
</style>
</tooltip>
<html>
<body>
<p><b>Name: %NAME%</b></p>
<p>Description: %DESCRIPTION%</p>
<p>Facility manager: %USER_DATA%</p>
<img src="http://chart.apis.google.com/chart?chxr=0,0,400&chxt=y&chbh=a&chs=200x200&cht=bvs&chco=AA0033,FFCC33&chds=0,200,0,200&chd=t:58.324,78.107,24.271,50.659,62.36|104.102,53.638,45.076,98.442,84.002&chma=|5&chtt=Business+Unit+Expenditures" width="200" height="200" alt="Business Unit Expenditures" />
<img src='http://bit.ly/lzXEoB' width='128' height='128'/>
</body>
</html>
Plug that into the 'tooltip' field on a building object in Infrastructure Modeler, then make sure Tooltips are visible in the View menu, and hold your mouse over the building in the scene.
You should see something like this:

Yep... that's two different Google Image Chart images embedded in the tooltip (one is masked with a bit.ly call).
If the HTML-like code above is too complex, then try a basic webpage. Here's all I entered to get the next image:
http://atlandsend.typepad.com

And if you have an enterprise portal with a simple RESTful web interface, you can even try calls like this call I made to the Google AJAX search service using the %ID% of the building:
http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=%ID%

In this case, the building ID is 287 and the service returned a bunch of results about Interstate 287... not that helpful here, but there's a ton of power in this little request.
Happy tooltipping!