Is is possible to replace the CD drive in a 17" macbook Pro with a SSD/second HD? Basically the Title:

Is is possible to replace the CD drive in a 17" macbook Pro with a SSD/second HD?

I'm looking at buying a 17" MBP, and I am having a hard time deciding if I want a HD or SSD. 

My MBA has a SSD, and it's very fast. However, I am already almost out of space.

My desktop (a windows box) has a SSD for the OS and often used programs, and a HD for long term storage. It works extremely well

Also, I think I have used the CD drive in my desktop about twice in two years, so I don't really need one, particularly in a laptop.

What I would Ideally like to do is simply replace the CD drive with a big HD, and use a SSD for the OS.

Is this possible? I can make up a custom bracket to hold the SSD in the CD-drive enclosure. However, I do not know what kind of interface the CD drive uses.
System Profiler is an application that will show you hardware information to determine which bus the CD drive is connected. Once you know your hardware specifications, you can shop better. 

Check MCE optibay and OWC Data Doubler for housings that work physically with SATA connectors. Also check Remiel's article on the issues you might face moving to an SSD / HD combination.