Me, I'm paranoid about my pictures. I'm really sure Murphy is out to get me!
Sometimes I'm even right--boot drive on this machine died an ugly death 9 days ago. Wasn't worried about the pictures because they weren't on that drive and I knew they were protected--wish I could say the same about the mail files in Outlook
The first thing I do after getting anything important on a card is dump it to the PC drive. If I was a pro, I don't think I'd want to go anywhere without a laptop so I could get everything stored in at least two places at the end of a shoot. For me, images get put on the PC ASAP but stay on the card until I've written the "protect copy" CD for that batch. At least monthly the entire photo tree is backed up to DVD and across the LAN to another machine's hard drive.
Memory cards will get erased at the wrong time (oooooops
). Hard drives will fail. Count on it and plan for it. Now if I could just remember to backup other stuff as well as the pictures... nahhhh I got my priorities straight