How to Format an SD Card that won't mount?

This is the closest forum I could find for this, I have an SD Card which I used when taking photos on my Canon T1i on a family outing. I have pictures of my new born on there from the day. When I got home that day I immediately went to copy everything to my computer; however, the SD Card could not be read.
* It does not mount on any Mac (mini HDMI & eMac, internal slot & card reader that both worked previously - 16 GB card)
* The Canon says "Card Cannot Be Accessed" - when attempting to format I get "Cannot format. Change Card"
My hope was that I could initialize (ie: non-low level format) the SD Card then use one of the many apps out there to restore any recoverable data.
Question is... how do you format a card in a situation like this?
I was going to use my work laptop (PC) which had a card reader, insert a diff card, find the driver letter, then format h: /q (assuming h was the drive letter)... with a last second swap with the bunk card... but my laptops card reader isn't working at all (just found out when attempting this).
Are there any other ideas? I do know that the name of the card is "No Name" and I was hoping to format it via some terminal command or via some magical utility that I have yet to find.
My worst fear isn't to lose all the photos (that would suck bad), but that I would have to buy another card (I'm not up for the task of soldering a new controller chip to the memory). Also, the console does not come up with any error messages.
Any help much appreciated.

Thanks Niel; however, Disk Utility does not see it on either computer (mini or emac)
Then the problem's one that reformatting won't resolve.
I saw somewhere a command to format a HD that was not mounted; however, it was for a diff OS and the command didn't map (was a *nix variant).
Even if a volume's not mountable, the computer's aware of its presence and the Disk Utility list will show it as a grayed entry. The Disk Utility won't show network volumes, whether mounted or not.
Put a working card in the drive and check the Disk Utility again. If it shows up, consult a professional data recovery service. If it doesn't show up, the Disk Utility isn't designed to work on items of this kind; this may also be the case if only software provided by the manufacturer is capable of accessing it.
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