I uploaded some pictures from my Nikon D40 this evening and edited them in CS4. Then for some strange reason I deleted them from both camera and laptop before I uploaded them to Flickr. Is there any way I can retrieve them? Yes I did empty the recycling bin before anyone asks.
They will still be on the card. 'Image recovery' software is what you need (usually free with good memory cards) - I use Lexar Pro and have Lexar Image Rescue.
Don't access the card or hard drive at all if possible and download a copy of Recuva. It'll get your pictures back if they've not been overwritten yet.