I keep my new 13" in the box it came in, and just use an old Dell as my daily machine. My MBP looks like new still!!
Seriously - have a new 13" MBP (few days old). My first (have had an iMac). Why do I feel the need to protect it so? Why must it look like a work of art, and be made of aluminum that will scratch and make me cringe??
I've been weighing my options - if this is the machine my family picks up (i.e. 10 and 12yo kids), than I'm inclined for some significant protection. I haven't been able to decide between an inCase frost shell (which will still show the aluminum, but not show scratches like the Speck, but darn they are hard to find), or get an iCarbons skin (they look great, but hate to cover the beautiful machine up so much - and to get black or white? - and when will another 25% coupon appear?).
With the inCase shell, I'd likely pair it with a Moshi Palmguard. I already have a rearth keyboard cover.
If I was the only one using it, then I'd likely not bother with the exterior protection (I'm careful), and just add the palmguard and keyboard guard. I really don't want this to end up looking like the automotive equivalent of a vehicle with a front-end bra, side window vent shields, door edge guards, fake vinyl top, etc.
I picked up a STM Jacket for my sleeve. Nice looking, small, but can use it to carry out to the coffee shop if needed.