Eastern US bird CDs

["stoatwizard" stoatwizard]

I was over on a business trip to the US and took the opportunity to 
detour and record some birdsong in Boston MA and around Saranac lake 
NY. Thanks to the kind folk at Birdforum I've found out that I managed 
to record about 11 species in two sessions, where I only thought I had 
about three.

Since I'm from the UK I have no idea of what these sound like, and I 
still don't know what an American Robin sounds like though I saw 
enough. Is there a good all-round CD guide to the more common bird 
sounds of the US (or maybe this area of the US)?  Preferably one I can 
order online...?