Ever wonder where those MP Missions you play online get downloaded to?
C:\Documents and Settings\<profile name>\Local Settings\Application Data\ArmA\MPMissionsCache
I wish I knew this earlier, so I could edit them. They're not visible in your MP mission list, so you need to copy them there if you want to host a game with them.
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Jeansy, PM me if you've got any editing questions. I'm more than happy to discuss them. Having heaps of fun editing and without getting heavily into scripting files yet, just using some scripting commands.
Like Voics said, you can add the 30 or so public objects by default. To get another 200+ objects, you'll need to add
6thSense.eu's EditorUpdate (patches your files, so back them up) or
Germany 1985's Editor Update (but I don't recommend this one due to it's dependence on a mod file). The full list of object available then are viewable using the HTML download (39mb) in this forum topic
building classes. Use IE rather or FireFox's IE addon to view it though.