I have a 256MB Raspberry Pi and a 512MB Raspberry Pi, I haven't had chance to fully explore what can be done with them, one (the 512MB one) sits on a desk in my living room running RISC OS (which I recommend people try at least once), the 256MB one that I own has the Raspbian Linux distro for the Pi running on it, and I have tried connecting an LCD up to the GPIO pins but have yet to get that to work properly, but have not found the time to finish it off.
I have yet to use the Arduino though I may look into that at some point in the future.
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Thanks Tinkerbell.
Allegedly away with the fairies for 6-7 years