I read somewhere: "I organize, therefore I am." Seems an essential thing to stay alive, these days. It reminded me of a lot of other THEREFORE I AM's, so I started to look around...
First of all; well known Barbara Kruger. Recently in the reopened The Temporary Stedelijk in Amsterdam.

I shop, therefore I am http://www.barbarakruger.com/

But beside that there are more existence confirming ways to be [or not to be] 

I smell, therefor I am, of perfume fanatics Brian and Abigail;
... http://ismellthereforeiam.blogspot.com/

I tag, therefore I am, Jim Baretts, Soul Sphincter blog;
He also does some interesting blogging on augmented reality: http://realmixed.blogspot.com/
And on pedagogy: http://blog.humlab.umu.se/

I write therefore I am, of Dutch writer Karin Spaink. Funny to click on... http://blogger.xs4all.nl/kspaink/

I organize therfore I am, seems a logical one to be amongst the existing ones, but wasn't found...

Therefore I am... simple as that of the Boston Hard Rock, Indie band: http://www.myspace.com/thereforeiam