In addition to working on Haskell, I'd like to start learning some C in 2015. I've started working through the online version of Zed Shaw's
Learn C the Hard Way.
Since I work on both Windows and OS X (and carry a Chromebook around), I've been using
Digital Ocean's SSD cloud server for $10 / month. So far it's worked well -- I've been running Ubuntu and have had no problems installing packages for Python, Haskell, and C. It's nice to have a consistent environment regardless of where I'm working, and I just rysnc file directories back to Dropbox for backup.