In reply to haworthjim:
If you cleared the card then there's a pretty large chance that you'll have overwritten the previous day's pictures on the next. That's not to say that you won't be able to recover some, however! Sandisk cards come with a recovery software, ask around if you know anyone who has bought one recently, or indeed buy one yourself!
Out of interest, what was it that died on your Mac? If it wasn't the hard drive then there should be no reason why you couldn't have whipped it out and copied the photographs off it on another machine.