So this isn't anything terribly new, but I just got my temperature controller box wired up and running and am pumped so I wanted to post. It's not terribly complicated, but it looks pretty nice, it will both heat and cool, it has outlet connections, and only cost around ~$60.
I based the unit on the temperature controller at the link below... fantastic little unit for $44.50. This is the second one I've purchased and both are running great.
Here's a pic of all of the parts laid out and ready.
And here's the final unit. It has a power switch on the front, a plug connection for the cooling unit on the left, and a plug for the heating element on the right.
Currently running around 52F for a 10-gallon Octoberfest... totally pumped.