How can I improve the annoyingly slow internal speed on my home network?

view story

http://superuser.com – My network is already set up and has been working for "a while". I have wifi and wired internet on a bunch of devices and stations (more than I care to admit), the gigabit router is working and configured. Everything is wifi g or 100mbit or newer. I recently reloaded windows on 3 of the most used stations. My cap to the internet is 16mbit/1mbit which I just ran off of speedtest.net (and realize that i need to bang on TW for not giving me anything close to 50 like I'm supposed to have). Everything can be running like netflix, steam games, bittorrent, etc etc, concurrently and there's no proble (HowTos)