I've decided that I will probably always hear more birds than I'll see, so my new little scheme is to learn birdsongs and ID them that way. I've heard tales of people who can watch movies or TV shows and tell you whether that bird you just heard should really be wherever the movie is set, etc. Pretty impressive. My ears are good (years of musical training), so I figure this should just be a memory challenge for me.
I have a Stokes' audiocassette set, plus there are many web sites that feature bird songs. Among these are http://www.learnbirdsongs.com/index.php, which is pretty decent for the more common birds. That's a good place to start, I think.
Lens update: still haven't received my lenses from Surplus Shack. I guess the post is a little slow. I'm getting pretty antsy, though.