I get asked a fair bit why I use Centre Weighted metering as my everyday mode so I thought I might write a little bit about the subject. I was going to write a more detailed article on all the different modes but maybe it would be better if we all added what mode we use the most and its assets and pitfalls Might be more helpful than just my opinions
Now, back to CW metering. I use a full frame camera so I miss out on the extra 1.6 and 1.3 crop factors of some of the other Canon models (1D,7D, 50D etc) so I am often not as close as I would like to be in terms of focal length. This is balanced by the fact that I quite often crop substantially with the centre being the main focus (full frame allows me to do this quite aggressively).
This being the case, along with the fact that I pretty much always use the central focusing point, CW metering makes a lot of sense for me. I will of course adjust exposure compensation according to what colour the bird is as well as what lighting situation I'm in.
For dark birds in most situations I will add an extra 2/3 or even a full stop, for light birds in bright sun I take away 1/3 to 2/3 of light but most of the time with midtone birds in moderately sunny conditions I can trust the metered exposure.
Evaluative metering used to be my main metering mode on my 30D but since moving to full frame I found that it was often thrown out by something in the frame such as a bright highlight, a sandy beach background or a dark water foreground.
If you use one of the crop factor cameras that I mentioned above and you are working with a species that you don't expect to fill the frame with (skittish shorebirds for example) I would suggest you try using CW metering on approach. Also makes sense if your stalking skills are'nt too good and you find yourself cropping 90% of your shots.
If you are pretty sure you will be cropping with a focus on the central area of the frame it might help to yield a more accurate exposure.
Hope this sort of explains why I use CW metering. I still use EV occasionally (mostly for birdscape/flock type shots) but I have found that I know CW metering well enough to tell which way my compensation needs to go.
Does'nt really matter what mode you use as long as you know when and where to trust it and how to compensate appropriately.
Let us know how you meter your shots and the tricks etc that you use to expose properly