SD Card Unable to be Read; How to Recover Data?

Hi, I just shot this morning on the XDCAM using a RAW SxS SDHC adapter for my 16gb SD card. The memory card was getting full, and I believe that it automatically stopped recording. I took out the SD card. Later, I tried to watch the clips, but the memory card wouldn't load anything. It's just a picture of a SxS card in the middle. The green light on the side is not lit, it is off. When I am in record mode, there's no timecode, just a bunch of 0s. I tried loading it in my new MacBook Pro but nothing showed up, either. I don't know how this happened -- it's possible I might've left the camera on when I took out the card, but I am positive that the camera was not recording when this might've happened.

Is there any way to recover my clips? Is there any way to recover the card or make it work again, as it is not loading properly?

Thanks.

I checked the Disk Utility and it is not mounting. It also doesn't show up on my desktop. What else can I do to fix this problem, or are all my data lost?

see if the card will work in the camera - if so, try copying it to another card to recreate the directory structure on a new card...

also, (per someone else's post in this forum)

See this
http://www.aeroquartet.com/wordpress/2009/08/06/a-guided-tour-to-movie-repa.....
This is the site
http://aeroquartet.com/
his offer
http://aeroquartet.com/movierepair/repair.html

His name is Benoît Joossen and seems to be an expert at file recovery and seems XDCAM and "pro" format savvy.