Recommended Links:

wizards.com/d&dminis
The official D&D Miniatures website crammed with downloads, scenarios, previews, articles, tournament rules and a community forum.

DnDMiniaturesTO Yahoo group
Yahoo group used by many local GTA players. Great place to meet players and plan games with.

3rdedition.org
An great independent site with tons of useful information gathered in one place including recent D&D Miniatures news.