It's fun to download large popular files with BitTorrent. Take for example the security focussed OS that the great philosopher and patriot Edward Snowden runs:... Qubes OS. I would say the killer feature is the way it colours the windows of applications used in the GUI: black = trusted base level, the bare metal host OS, yellow = AppVM 1 which is this diagram is running most of the user apps like Thunderbird, VLC, Office, Firefox etc, red = firewalled untrusted sub-systems like USB peripherals and ephemeral WiFi connections, which appeared to be forced through a green = firewall running Fedora (wowzer!) and is also organising the connectivity for the sys-whonix VM that houses your decentral-VPNs such as Tor, and disposable VMs such Tails.
So Qubes OS is really hot right now! I'm setting up my first install of a highly available WordPress cluster that will power the in-store POS terminals of a retail store opening soon in Newmarket. This will let me (hopefully) run Xen Orchestration on the shop WordPress/WooCommerce/WebPOS cluseter while also browsing the web and checking my email if you get my drift.