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RAID0 works on SSDs just like any other drive. You get double the performance out of them. The problem is that with the insane speeds SSDs already produce often the bottleneck isn't the SSD itself but rather other inefficient operating system calls. This is shown clearly on the Tom's Hardware link above where any synthetic test shows RAID0 with nearly double the performance, yet windows takes just as long to boot and applications take just as long to load.
One thing no one has mentioned which is a BIG MINUS, is that RAID controllers currently do not support the TRIM command. TRIM is a critical command on SSDs which allows the operating system to tell the drive which blocks aren't in use after a delete. SSDs unlike normal drives have crippling performance when it comes to re-writing data as opposed to writing an empty block. Without TRIM support your SSD (especially an SSD which is nearly full) will quickly start degrading in performance, and in the end the only way to get full speed back out of it is to use the manufacturer's software reset the drive which also wipes everything.
So in summary, don't do RAID in any form on an SSD unless you're going to spend thousands on your RAID controller to get one that supports TRIM.
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