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Don't forget the Egg Birdfeeder:
http://dwr.com/productdetail.cfm?id=7273

But seriously, if you are committed to feeding birds:

1) Do not underestimate the amount of food birds (even the tiniest!) go through. So, while some of the designs above are gorgeous, you'd have to refill every 5 minutes...

2) You can't stop. Birds actually get dependent on the source. But if you do stop, try to taper, and stop at a time of year when food is otherwise plentiful.