Here are some under the radar artists I really liked in 2007:
Karen Ann, a French Israeli singer based in NYC
Bat for Lashes, UK
Bloc Party, UK
The Cribs, UK
Hot Chip, UK, Best Live Band I saw this year
Klaxons, UK
M.I.A., UK
The Presets, out of Sydney, Australia
Tokyo Police Club, Canada
The Bird and the Bee, electro pop bossa nova from Silver Lake, LA
Black Rebel Motorcycle Club, Silver Lake
The Ettes, Silver Lake
Great Northern, Silver Lake
Silversun Pickups, Silver Lake
Pinback, San Diego