A brief demo of the latest in Capcom's court and crime adventure series is now available through the Wii's online Nintendo Channel. Of course, the demo's not playable on Wii--after it's downloaded, it must be wirelessly transferred to a Nintendo DS. nope
The Nintendo Channel itself can be acquired as a free download in the Wii Shop Channel, with the demo (and several others) found under the DS Download Service. This particular demo will be available for the next week, through February 7.
Should you not have a Nintendo DS, you can still get in on the Ace Attorney fun, though not with this particular entry and not for free--Capcom is currently in the process of bringing the first three Ace Attorney games to WiiWare, with the first already available.