Looks cool! Why do you need the additional breadboard to hook up the sensor? Wouldn't it work if you would mount the sensor on the shield?
Ahh now that's why it's called prototyping
For anyone who's interested, I presume it is the LM35 analog temp sensor that oomlout sells.
Also, the decimal you have is completely pointless as the precision is only 1C. I know it looks cooler though
I do like the light on dark LCDs. Maybe I need to buy one to add to my collection. Ebay'll have one for £5 or so no doubt. My last 16x2 was £3!