I don't have the best luck with air travel. Remember?
Delayed flights? OK. Bump me? Well, I'll get there I guess. But lose all of my backpacking gear? 
Who are you tryin' to get crazy with, ese? Don't you know I'm loco?
As I type this I am on hold with Delta Airlines for the (not even kidding) 10th time since they lost my gear on a flight to Seattle last week. To add insult to injury, they delivered someone else's tent with my luggage tag on it. I'm filing a claim, which requires me to itemize everything that I was carrying...its over $1600 worth of equipment (purchase price anyway - that surprised even me!)
To scrap enough gear together to go backpacking, I had to borrow clothes (John - your jackets are at Jayson's place), a pack (imagine a pack worn by a 110lb woman on my back), and rent gear from REI. I can't say enough about REI - even in Manhattan where boxed wine can be delivered at 1 in the morning, there would be no way to rent backpacking gear at 10am on a Saturday. REI - if I wasn't a lifetime customer already, I am now. You saved my trip, really.
Rather than rant on about this, I thought I'd pass some tips along that I learned about flying and if you have to, checking luggage:
1. Don't fly Delta. Or US Airways. Find a carrier that you like and stick with them, even if the flight might cost $100 more (much cheaper than say...$1600).
2. If you can help it, pay the extra money for a direct flight. Two stops double your chances of airline nincompoopery, three stops triple, etc.
3. When packing, tape your personal contact info, itinerary, and yes, items being packed on the inside of your luggage. Remember, airlines are not responsible for computers, cameras, or any other packed electronics if stolen.
4. When checking luggage, do not leave the counter until you watch the agent tape the tag to your bag and place the bag on the belt. I would even go so far as to ask to double check the tag. Don't be embarrassed - they don't trust you (can I see your I.D?), so why trust them?
5. Airlines generally give you three weeks to file a claim - any longer, too late. Even after you file, it can take them 6-8 weeks to pay your claim. So don't wait - if your luggage isn't back to you the day after its been lost, trust me its lost. Unclaimed bags are sent to a central processing center (think Indiana Jones and the Lost Ark), where its contents are itemized and computerized. When you file your claim, a computer will check the database for probable matches. If no match is found, eventually you get paid. And your bag? Well, if its ever found, it belongs to the airlines and ends up here: www.unclaimedbaggage.com
6. Finally, take your story and email it to airconsumer@dot.gov. Yes, in the grand scheme it doesn't do much. But if an airline is going to lose your stuff and then sell it to greedy vulture bargain hunters, the least you can do is voice your displeasure to the US government.