Quoting Grendell:

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When I went to school, I was always taught that EVERY word in a title should be capitalized except for a, an, and the.

The general rule for some time has been everything excepts article, coordinating conjunctions and prepositions (except at the beginning, end and after a colon, on which case you capitalize them anyway), but as mentioned earlier, there's disagreement on some prepositions. The Chicago Manual of Style, which is usually considered the authority on American English, says not to capitalize prepositions ever, but other source do say to capitalize longer ones. See here:

http://www.writersblock.ca/tips/monthtip/tipmar98.htm

http://grammartips.homestead.com/caps.html

It looks like there are three competing rules here, ranked from apparent most to least common:

1. Never capitalize any preposition. (unless it's the first or last word or immediately follows a colon)
2. Capitalize prepositions unless they have fewer than five letters. (plus the usual exceptions)
3. Capitalize prepositions unless they have fewer than four letters. (plus the usual exceptions)

So it looks like there's general, but not total, agreement that "over" shouldn't be capitalized when used as a preposition. Most logos don't used mixed text and most movies don't mention their title in the overview either, but in my collection, it's "The Battle over Citizen Kane."

And I always thought I'm the only one having problems to decide which english words to capitalize, because I'm german...

Most times I just copied episode names from the cover or the disc menues, but since a lot of menues use only capitalized letters...

Luckily I did only very few RC1 profiles (mainly cast), so in case this thread comes to a conclusion (sooner or later  ) I have not too much of correction work ahead.

Quoting TheMadMartian:

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In this particular case, since 'over' is not a joining word, it should be capitalized.

Prepositions do join the rest of a sentence to a prepositional phrase, so if you're going to be strict about joining words, they shouldn't be capitalized.

I would vote yes on a proper grammar change in a title. So "Over" was changed to "over", it would have my yes vote.

Quoting Graveworm:

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I know this is a dead horse but where does it say to use standard capitilisation or indeed to change the capitilisation from what is on the cover for English titles other than joining words?

Mmmmm dead horse meat tastes funny! 

It doesn't explicitly tell us to other than "Check capitalization of the title." and it also gives a number of examples of what I assume is capitalization checking...

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"Lord of the Rings" is correctly capitalized. "Lord Of The Rings" is not. "The Matrix Reloaded" is correctly capitalized. "The matrix reloaded" is not.

I guess neither matrix nor reloaded are examples of "joining words", yet we are told to use one and not the other.

Quoting hal9g:

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Using the term "joining words" was just a stupid choice of words in the Rules.  It should have said articles, conjunctions and prepositions.

^This.