I just went on a trip to Louisiana (New Orleans and Baton Rouge), but before I took my brand new 5D3 and my other gear, I called up my insurance agency and scheduled (their word) coverage of my gear to be included on my homeowner's policy. For $93/yr ($7.75/mo) added on, I have the following protected if I drop it/break it/someone steals it/etc:
-5D Mark III
-50 1.8 II lens
-B&W UV filter
They schedule it right then and there, making it effective immediately. If you have all of your receipts that you can scan over to them, that makes it even quicker. Talk about peace of mind when it goes through Xrays or you trip on a rock and drop it.
Also, just a tip for any of you who purchased any gear from say Adorama or whoever's eBay store: If you send in your eBay receipt, *even if* you purchased a new in box item, there's a good chance your insurance agency won't take it. At this point, they will only insure the camera up to the price you purchased it (like those of us that got the 5D3 at a great sale price of $2749) and not MSRP. However, Adorama Customer Support was nice enough to send me an official receipt when I asked. If the insurance company still won't go full MSRP on an item in this case, tell 'em its bullsh#t that you're getting shafted because you bought something on sale and they'll probably say OK.
Sorry for the long post, but I hope people find it useful. (edit: I didn't see that AdamF made a comment to this idea too prior to posting)