Tomorrow Google Reader shuts off, have you grabbed your data? The easiest way to backup your subscriptions from Google Reader is to use Google Takeout. This will give you a .zip file with a lot of data, including a subscriptions.xml which you can import into any RSS reader that accepts an OPML file.
This is fine for your list of subscriptions, but I have been using Google Reader as a particular search engine, allowing me to search for items that I have read. I lost this ability with Google Takeout, but then I came across Reader is Dead. Mihai Parparita has created a couple of scripts that back up not only your subscriptions, but also all the items in Google Reader. For me, it was 928,981 items to be downloaded.
Under OS X the script ran right out of the box. If you are on Windows, you will need to install Python first.