There is some important information in the Info.plist files contained in Mac OS X applications. But, some of that information isn’t really standardized — I’m looking at all of you, you crazy version number and vendor attributes (just the ones I'm interested in!). So, given that, how do you find them all to make comparisons between Apple and third-party apps?
Answer: You can use the “find” command to find all of the Info.plist files for applications in your /Applications directory.
$ find /Applications -name Info.plist -ipath /Applications/\*.app/Contents/Info.plist -depth 3 -print 2>/dev/null
Since that intentionally limits the depth traversal, you could modify it slightly to support finding Info.plists in your /Applications/Utilities directory, as well. However, I would say it’s less likely you’ll be dropping third-party applications in the Utilities directory, so you might not care.