Alright then, we'll do a common document file of it, then, and have a thread for those that want to contribute? As long as there are common rules for contribution (common format, common language, etc.) I'm sure people on the site could be quite helpful, overall (giving the meters of tracks and even entire soundtracks, if they're up to it, and pointing out possible errors in the tracks).
When I say 'common language', I mean use some sort of standard when listing time signatures. No 'Common Time' or 'Cut Time' for example - these can easily be replaced with '4/4' and '2/4', respectively, without losing too much meaning. If the numerator is higher than '5', then the denominator will be '8' (There shouldn't be a '5/8' or '7/4' - they'd be '5/4' and '7/8', so it'd be easier to compile into the tagging system). That Marx song would be considered a general 'Mixed Meter' - there's just no practical way to approach a song with that many changes otherwise. There's a bit more to it than that, but that's a start to a system to work with.
Level 99 already presented a standard format to present the tunage in the thread, so we could stick to that, for the most part (although finding the source shouldn't be mandatory, and the handling of multiple meters would be nicer if simplified, like I suggested above). I could do the Megaman soundtrack + FF series soundtrack real quick, if you want a place to start your doc, Level 99.
And yes, that Marx track is really insane.