While trying to figure out the problem in this post I wondered why Google Chrome was using up so much RAM on my machine. Turns out that every extension you install in Chrome causes it to run another instance of chrome.exe in the background. I had no idea! All of the instances of chrome.exe on my machine resulted in about 500MB of RAM being used up!
So, just a heads up… if you install lots of extensions be prepared to use up a lot of RAM.