USB tuner huh? when would you find one or know if you need it? i wish more hotels let you have composit out or s-video 
Check out Fry's Electronics, Best Buy or the 'net before your next trip. Lots of tuners out there, usually sold as "watch TV on your computer" gadgets. You'll probably want one which handles as many standards (NTSC, PAL, SECAM) and operating modes (analog and digital) as possible if you plan to do much traveling with it... Disney's "World" is multi-standard. A quick Google for "USB TV TUNER" shows TerraTech, Hauppauge, HP, Ads Tech, and many other manufacturers. I don't currently have one so I can't recommend one over another.
From my experiences at WDW and TDR (and HKDLR):
WDW value and moderate resorts: you need a tuner of some kind (VCR, DVR, or USB/laptop) and probably a couple of tools to disconnect furniture from the wall before disconnecting the coax from the back of the set. I haven't encountered any coax locks - metal sleeves which make it difficult to disconnect the coax - at WDW but that doesn't mean that there aren't any.
TDR Ambassador and MiraCosta: they use the NTSC standard in Japan so I was able to disconnect the TV side of the RCA cables coming from the set-top box and connect to my US camcorder. I had to monitor the recording on the camera - my Sony only has a single jack for input and output - but it worked well at both of the official "Disney" hotels.
TDR "partner" hotels: There was a resort channel at the Mitsui Garden Hotel Prana, but no way of recording it without a tuner. I'd imagine that a USB tuner or VCR would work but prices are higher in Japan (from just a bit to extremely) than in the US on consumer electronics so I didn't attempt to find a solution.
HKDLR Disneyland Hotel: All the rooms had plasma or lcd panels directly connected to the coax, thus my suggestion of a USB tuner which can handle multiple standards - Hong Kong uses PAL - and modes to give yourself a decent chance. I didn't carry a laptop with me so the USB trick didn't work and I didn't have time to wrangle up a VCR... maybe next time. Consumer electronics are much more affordable in Hong Kong so buying something there to keep or leave behind might have been worth it.
I've yet to find a hotel anywhere which has intentionally provided composite or S-Video outputs but most of the resort-area hotels have inputs which can be used for camcorder or DVD playback. They're not interested in enabling you to transport their content out.
