I'm not sure if this is a part-time deal, but mlb.tv is now available, and the premium costs $110 dollars this year, 10 bucks less than last year. Premium features include: 800k and 1.2m streaming(although I heard a lot of people had trouble with the 1.2m stream last year), and all of these that are new for 2009: HD picture quality(where available), Live game DVR functionality, multi-game viewing options(I guess they improved the mosaic), live game picture in picture, live game chat, live game radio option, player tracker).
If live game radio option means that they sync up the radio audio to the tv video feed, that would be the coolest thing ever(I like Tampa Bay's radio crew more than their TV crew). And from the description, that's exactly what it sounds like. Kickass.
And the DVR function sounds awesome too, so like if I have work until 8 but the Rays start at 7, I can get home at 8:15 and just start the game from the beginning and watch from there.
mlb.tv regular is also available for 80 dollars, 10 less than last year. I got regular last year and didn't have too many complaints, but I'm definitely getting the Premium for 2009. Apparently 800k is the picture quality for both the regular and the Premium(regular was 400k last year), but the HD quality picture(I assume this is a working version of the 1.2m stream) is Premium-only.
There's a 1:30 demo video that you can watch on the link I posted which probably explains things better than me. This seriously sounds awesome(I'm a Rays fan living in NJ, I visit this board because of the active baseball talk), I can't wait.