A WebmasterWorld thread has a theory that smaller pages tend to rank better in Microsoft's Live Search (MSN Search), than larger pages.
Senior member, crobb305 explains:
Has anyone else noticed that very small pages rank highest in MSN? This could explain why doorways and blogspots rank so well. To test this, I reduced text on my homepage down to just a paragraph or so, with links to my internal pages. The content reduced from 22k to about 5k. Within 2 days, the page went from page 5 to page 1 for a competitive phrase.
BillyS, another senior member at WebmasterWorld wrote:
I've seen this too. MSN does not seem to care about the number of words on a page. I saw an "About" page rank very high for a competitive phrase - all the page had was about two paragraphs and the phrase was mentioned once.
Honestly, I have no idea. I am sure there are examples of this going both ways.
Forum discussion at WebmasterWorld.