Just wondering if anyone would volunteer tips on capturing the wings of birds in flight (for those of us with non-pro gear !!)

I have a long way to go just being able to track them to get them in the frame - assuming I eventually get that skill...what are some other things that would help?

These are a couple from lunch hour - I know the focus was not right (I cropped the bird feeders out - they were nicely in focus!).

20120222_2315 by 4mozaSmiles, on Flickr
60D 70-200 w/ 1.4ii f/4.5 1/2500 280mm


20120222_2305 by 4mozaSmiles, on Flickr
60D 70-200 w/ 1.4ii f/4 1/8000 280mm

Thanks for your help!
Brian