Reading about writing is not writing.
Reading about all the reasons people do not write is not writing.
Feeling bad about not writing is not writing.
Planning time to write is not writing. 
Watching LOST is not writing.
Shopping for writing tools is not writing.
Talking to people about your writing project is not writing.
Looking for the perfect place to write is not writing.
Redesigning your website is not writing.
Whining about not having time to write is not writing.
Searching for the perfect writing software is not writing.
Organizing your pens is not writing.
Listening to Grammar Girl is not writing.
Grading papers is not writing.
Teaching class is not writing.
Browsing The “Blog” of “Unnecessary” Quotation Marks is not writing.
Googling “developing a writing habit” is not writing.
Going to Starbucks with your writer friends is not writing.
Talking with your therapist is not writing.
Shopping at levenger.com is not writing.
Training for a marathon is not writing.

Ironic: This has been sitting in my drafts folder since December 19.

What about you? What do you do when you are “not writing”?