Re: Lets see some TV mounting ideas!
I have a wally world swing-arm over my desk on the (19"??) monitor on my PC. If it were bolted to something sturdy, I wouldn't be afraid to use it, depending on weight, to secure a screen up to about 30" when in motion. I probably would put a pair of footman's loops (even the guys at ACE hardware don't remember these) behind the monitor. I would swing it flat and bungee it to the loops to keep it from moving around. With a little ingenuity, it might be possible to install flat plates between the pivoting sections with holes that would accept stabilizing pins instead.
I think the monitor and arm can lift off the wall post if a set-screw is removed, but I haven't investigated this.
The good news is that there is standard machine screw spacing in the flat screen TV/monitor industry, so there are dozens to hundreds of different mounts to choose from. Mine was just (relatively) inexpensive and easily available.
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.