If you're on blogger and wish to join the blackout, you can follow these instructions:
Download a backup of your original Blogger template FIRST!!! If you do not do this, you will not be able to restore your blog.
Download the SOPA Blackout template from here.
Extract the .xml template file from the .zip file.
Upload the SOPA Blackout .xml template at 8am on Jan 18, 2012.
Upload the backup of your original template at 8pm on Jan 18, 2012.
This November, send donations to the competitors of those politicians who voted for SOPA.
As I'm not going to be up at the time, I'll be switching over at 12:01 AM tomorrow, rather than 8AM