All this talk about this unique yellow wing bar got me to research similar sightings. I found a 2008 article with a few photos of a 'yellow bar blue-winged'. I was going to send by email, but I thought a few others might be interested in the article:
http://naturalnotes3.wordpress.com/2008/05/08/blue-winged-golden-winged-warbler-hybrid/ The photos show most of the attributes of a blue winged warbler with the exception of the wing bars. Is this similar to what you saw? Sounds like an great find either way! I would also love to here others thoughts about it as well.
