In this video, I'll show you how to add a secondary (or primary, depending on what will be on the drive(s)) SSD or HDD to your MacBook [Pro]. It's really easy, and takes about 20 minutes. You'll need some things, though:
1) The new SSD or HDD that you want to add. Here's the one I installed: http://is.gd/fNYE8
2) This SATA caddy ($19.99): http://is.gd/f6czb
3) This enclosure for your optical drive, if you'd like to use it as an external drive ($6.75): http://is.gd/f6cyI
The process is simple:
1) Remove the optical drive (and place it in the new enclosure)
2) Install your drive into the caddy
3) Install the caddy where the optical drive was