Gibble - 6:27 pm on Mar 9, 2012 (gmt 0)
We shouldn't think about this from a webmaster or SEO perspective. Webmasters may not like hearing it, but neither Google nor Bing sees webmasters and SEOs their primary concern. The average user is what concerns them. How much traffic they send you, or whether or not their ad-serving matches your page content perfectly comes second.
And that is why Images, Videos, Maps, etc results will be included by google, bing, and any other search engine. Because as a regular user, just surfing for information, they want that.
Personally, if I search for "Planted Aquarium" I want images and articles. Images and Videos for inspiration and articles for how to set it up. I as the average user, won't want to toggle between strictly image search, strictly video search, strictly site search to get all the information I want.