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It's of course worth it for some people. If you can afford it, it's great.

Some people do that in their Apple laptop, by using SSD and a spinning HD in the optical drive slot.
 
2 Drives

I run two drive in my MBP and the OS and all my applications are installed on the 128gb ssd and all the other data (music, pictures, documents, whatever) is on the spinning disc. Oh i have windows installed on that disc too, i use it to play the occasional game which doesn't benefit from the ssd all that much. Its a great setup an ssd is amazingly quick.
 
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