Hot Conceptual Action

Let's talk about things that get you conceptually aroused, but not in a directly (or even indirectly) sexual way.
Things that give you a mental woody.
Things that make you squeeee in geeky glee very thought of them, due to them hitting just the right part of your brain.
Things that give you a rush of "I gotta GET me one of these!", where "these" can be pretty much anything.

[Poll #559639]

I've answered the poll as well, just so you know what I have in mind.