Software developer, almost exclusively C++. Getting paid to work on open source code OpenFOAMhttp://www.opencfd.co.uk
Lots of (data-distributed) parallel stuff (MPI etc.) Few 3D meshing and geometry algorithms.
Only when necessary. Did manage to get our cluster up and running. Running Suse for the last 8 years or so but only because I'm familiar with it. Like the fact that every version is getting better. Hate the slowness of change & messy setup.
Latest Linux toy
sshfs. Now I can edit my remote files using my favourite graphical text editor (Nedit).