Connect MacBooks via USB Cable/OS X Lion

I have a simple USB cable and I would liek to use it to connect two MacBook Pros with each other so that I can use the healthy one to scan the failed hard drive of the other. Is that possible? If so, how?
Also, I would like to know, whether there are any good reasons for spending money and upgrading from Snowleopard to OS X Lion?
Thanks for the advice!

You need to use a FireWire cable to connect the Mac's put one in target mode (hold down the T key while restarting) and then make your connection.  My advice is to upgrade to Lion if your system meets the minimum requirements. 

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