TV tuners for handhelds, ever owned one?

I haven't, as they were usually rather expensive and I'm not a big fan of TV (especially the local channels). But it does look like a useful thing to have if you happen to be addicted to those shows like 24 and so on.

Here's a list of handhelds that had a TV tuner created for them:

Game Gear
GBA / Micro
Nintendo DS (Japanese company made it)
PSP (Japanese as well)

Also, it's worth noting that soon TV in North America will be going digital therefore it means that a lot of these tuners might not be of much use at that point.

you forgot psp slim japan only

Ah true, I've added it to the list.

Also, it only works for Japanese TV right?

It is a nice feature, but yes, if it isn't a digital tuner, kiss tv goodbye.
As for an update, this is the tv I have settled on. Better than that Sanyo.

32" 720p Sharp LCD tv with analog and digital tuners. It is for my bedroom, that is why I am not going for the full 1080p.
$600 is a good price for one of the best out there too.

Looks pretty good for that price. It looks similar to the one I planned to get a while ago, however, I'll probably wait a bit longer to get a new TV as there's a handful of good upcoming games coming out soon so I rather use my money on that and then get the TV later on.

It is convenient for me, my birthday is 2 1/2 weeks before Christmas, so my gifts are usually bought on the Christmas savings.