Hey everyone - I have found a fantastic resource. (We may want to consider making this a sticky.)
Want to know what you're allowed to bring on the plane? The folks at Gate8 have done the research for you. (Disclaimer: I'm not affiliated with Gate8 whatsoever, but I am a fan of their products.)
Check this out:
http://www.gate8-luggage.co.uk/hand-...s-for-airlines
You can sign up for email alerts if there are changes, but it's an impressively comprehensive list of every airline I could think of - including a few that don't even exist anymore, for what that's worth.
If you can think of an airline that's NOT on there, I bet they'd add it.