What do you do with your Pi?

What cool stuff have you done with your raspberry pi? I have had one for like 6 months but still haven't done a thing with it. I'd interested to know what you guys do. A lot of people tell me to use it as a file server or something but I only have 3Mb/s connection and my home network is 100Mb/s, plus I don't really see a use for that.

What is a good storage card for it?

Also, I wonder if it is powerful enough for steam in-home streaming? I doubt it.

You could use it as a HTPC.

I have two Pi's and I use one of them as a small linux box that I just hook up a monitor and keyboard to.

The other one, my robotics team has been using for basic prototyping.

I use mine as a SSH-node to access IRC's using Weechat.

I have aslo had it running as a control-server for my nespresso maker.

We have one at work mounted above the door to our office, when the door is opened it pauses our music.

I use it for playing with Plan9 from Bell Labs. It was supposed to be the replacement for Unix but it didn't catch on.

Also, Minix is pretty cool it was the project that inspired Linus Torvalds to develop  Linux. It will run on a Rasberry Pi too