There are probably at least two groups that have recorded under the name Windborne. Only one of them seems to be active in 2009.
1. Windborne is the Peterborough NH USA based folk/renassance/acappella duo[[/tag] of Will Thomas and Lynne Mahoney. They issued a self-titled album http://cdbaby.com/cd/windborne in 2008, including a shape-note songs, italian songs, renassance music, and contemporary compositions, and many others difficult to categorize. Read more on Last.fm