2. Equipment. Already had a few comments regarding this but at the settings your displaying your images should sharpen up better than those posted unless of course you have already sharpened them in which case your lens/camera combo must be terrible. Look also to use noise reduction sofware to tidy the images up. Noise Ninja or similar but dont bother with the standard filter plugin that comes with PS as its next to useless.
Just had a look through some of the photographs again, and looking through i can see some sharp enough pictures, and then again i can see some quite unsharp pictures. Not sure whether its the 70-300 or me. Hopefully i am picking up a sigma 70-200 2.8 this week, heard some good things about this lens.... if i can get a good copy
CaptainPenguin: I think that i am with you on the standard cropping, but thats just our opinion. Also had a look through a couple of your flickr shots..... and they are pretty damn good. If only i could get that kind of sharpness...