There are @tv issues and there are mlb.tv issues.
For the @tv issues, everything aresee said is 100% on the mark (thanks aresee!). The easiest way to get MLB content on your @tv would be if
MLB had a contract with the iTunes store, which is not gonna happen
. Another way to get content to your @tv would be if you could get the video in an Apple compatible video format unencumbered by DRM into your iTunes library, but that won't work because the content will be in the Microsoft proprietary (i.e. non-Apple, non-Linux) WMV format including DRM-protection for your viewing pleasure. You could
use something like Flip4Mac to transcode the WMV files to something more Apple-friendly like MOV (i.e. QuickTime) except for that whole pesky DRM thing. And with MLB.tv, that DRM thing turns on a dime. People
who bought content from MLB.tv a few years back found that their purchased, downloaded content stopped working one day when MLB.tv switched DRM formats on them. Not a nice way to treat your paying subscribers, but hey this is
MLB we are talking about here...
Here's what is boils down to: MLB.tv is about watching baseball on your computer. Period. Not some external device/iPod/media center thing MLB doesn't approve of (or didn't charge extra for). MLB just isn't that forward thinking. They make the NFL seem downright progressive but what else would you expect from the former "national past time". If you want to watch baseball on your TV, they sell the MLB Extra Innings package via cable or satellite and maybe a DVR or two.
Good luck and enjoy spring training. Me, I've given up on those bozos...