The capitalization, by the mods, of thread titles is overkill. Diminutive (minor) words should not be capitalized.
According to the CMS “In regular title capitalization, also known as headline style, the first and last words and all nouns, pronouns, adjectives, verbs, adverbs, and subordinating conjunctions (if, because, as, that, etc.) are capitalized.” And Garbl states “Capitalize only proper nouns and the first word in headlines. To improve readability, avoid capitalizing all the letters in more than one or two words in headlines and headings. Punctuate headlines like sentences.”
See http://www.webreference.com/internet/writing/headlines/capitalization/ for more details.