I go through them all and delete the bad ones that don't stand a chance, as well as ones that are very similar to another (when I take multiple quick-shots). Then I save that batch in it's own folder. From there, I pick one variation of each subject and upload it to Flickr.

I really should be more organised too, and delete the ones that are rubbish (most of them then lol).

But I have to say, I've gone back through photos and thought, 'hey that one is ok' when when I first took it I thought it was naff

After a shoot, I load mine on the pc, delete all the obvious bad ones (blurry, cut offs etc) then go through the rest to process 1 by one, I only keep those worth keeping, the rest get binned.

I delete everything that can't be saved, so anything out of focus or too grainy gets deleted, i then back everything up onto my external hard drive (i need a new one).

I go over the photo's in Aperture on the day they are taken then i usually leave them a day or two and then go back to them and any i still don't like or can't be saved get binned.

yup, thats the same as me, but you explained it better

again, i do what Sam does - unless their candid shots of the kids, even if they are rubbish, i keep them

You take rubbish shots never

LOL you wanna bet!