Yeah I've got a Pi 3, used for scratch to GPIO for the kids then and now Ive set it to dual boot to a media centre (still needs setting up), going to set it up with my usb harddrive to have it as my main network storage too. My Old pi1 I am going to set up to do my backups from my inlaws house syncing via BitorrentSync.
I have a couple of Pi2's, one is a motion sensing security camera using MotionEye, the other was running a Kodi media server, but I replaced that with an Amazon Fire stick, so it's temporarily running Ubuntu Unix (with a couple of add ins to make it look a bit like a Mac) for developing some Linux scripts for work. I may become a disk server at some point but needs a bit more work.
I love these little boards, such clever use of modern components and so accessible.
I've got two Pi 3's from RS components, along with one NoIR camera & one normal HD camera module. I'm currently using them both as security cameras.
The NoIR one is in my garage with a infrared lamp for illumination and the other is looking out a window towards my front door.
They're so easy to set up & stream over the internet. I've no experience in Linux (or Noobs operating system) but the forums and guides are brilliant. I'm looking to add a few more to watch my garden and front driveway once I've figured out how to mount them outside & keep them weather proof.