Nintendo's own president, Saturo Iwata, has announced that pricing for downloadable games in the Wii's Virtual Console will range from 500 to 1,000 Yen, about $4.50 to $8.99 in USD. This is in comparison to Microsoft's "points" system, which has you spending somewhere between $5 and $12.50 for a title, and whose library is considerably more limited than what Nintendo has planned for the Wii at launch which should include those tasty 1st party titles.
Iwata also mentioned some of Nintendo's plans for DS integration, which could include use as a touch screen controller for the Wii, DS game play on the Wii (ala GameBoy Player), and demo downloads via the Wii. It's not hard to see why Nintendo would want to closely tie the two consoles together, given the success of the DS.
News source: engadget