Nothing for the DS or 3DS this week either. I wouldn't have bothered posting this until the Virtual Console/WiiWare games come out, except for...
Rock Band 3 DLC (Tuesday; * has optional Pro Guitar/Bass for an extra $1) • Shinedown – Bully • Shinedown – The Crow and the Butterfly • Shinedown – Second Chance *
...starting April 1, Harmonix is temporarily halting Wii DLC (as well as PS3 DLC in Europe) due to "mandatory changes being made to our DLC publishing arrangements." Existing DLC will still be available and they "hope to resume regular DLC service by this summer."
Personally, I wouldn't be holding my breath waiting for Wii DLC to come back. My prognosis for European PS3s is similar. For whatever reason, the Rock Band franchise gets way more support (read: sales) on the Xbox 360.
I didn't know that the GameCube had online support, but the Playstation2's online support gets better every month. There are quite a few games with online support with plenty more coming out. A few off the top of my head that I personally own: