Anyone heard of this band?

Fraid not. Where are they from and what kind of mucis do they play?

Canada, indie music. Lead singer is a girl. From Wiki:

In 2003, Metric released their first official album Old World Underground, Where Are You Now?. The album was received with high reviews. The group released 6 singles from the album, the most successful being "Combat Baby". As of December 12, 2005 the album went Gold in Canada.

2 years later, Metric released their second studio album on October 4th, Live It Out. This album, like its predecessor, was received with high reviews. During this time, Metric was approached by and agreed to open for the Rolling Stones whose tour coincided with theirs in New York City. Live It Out has had quite the success in Canada, already selling twice as many copies as Old World Underground, Where Are You Now? and scoring them two top 10 singles for Monster Hospital and Poster Of A Girl. The new single Handshakes is expected to be as successful as the first two singles.

Sounds like they are relatively successful, but I've never heard of them.