I have a Ras Pi 1 and it bores me. I got it free from my college while attending and the coolest thing I could come up with was a surveillance center. But then I wired an Atom based netbook up for that, it was way better quality and 10X faster and I have done nothing with it for..... 2 years now? It had Lakka on it and played earthbound for 10 minutes.
I recently (today) found the Parallella computer though. With a Pi you have 2, maybe 4 cores depending on the model, that all pull the same power around that a pentium 3 could in an ARMv6 architecture (though I bet its better now). My Pi 1 runs linux like a turd. It runs, but about as efficiently as a cow moves in Lava. I can't really do anything I want with it so I do real computers.
However finding the Parallella today gave me more ideas than ever. If you haven't heard of it, its a machine the same size as a Pi, has a head chip with 2 ARMv9 cores and a 16 core RISC chip tied to it giving your 18 cores. A school group worked with some as an excercised and found that in doing a prime number check from 0 to 16000000 in serial (core by core) it could find all the numbers in 4 ish minutes. But all the cores working in Parallel, the process was done in about 18 seconds, with their unit. He did say speeds would vary.
Personally I would use this as a proper RISC station for RISC development. While people use Pi's for that, I would use this and not only have a number of options to build off of, but probably be able to find a wierd bit of math that really makes this thing unstoppable. Comparing my Pi to that, it'll just be some wierd Amiga thing some day and stay that way. Parallella is totally awesome, I just wish I had those ideas pop with a Pi though.
So what do you guys do?