Catalyzer is no longer looking for submissions. It's been great running this site for the past few years, but school and work have often gotten in the way of responding to submissions and otherwise doing a good job as the editor of an art site. For a more up-to-date site with a similar focus (and another place to submit writing), check out 3:AM Magazine.
Some points to consider before submitting work:
Submissions must be your own original work. Catalyzer publishes poetry, short fiction, non-fiction writing, photography, and all forms of visual art in formats presentable online
Submissions should be sent in the body of an e-mail, in Word format, or plain-text. Images should, preferably, already be web-formatted and not exceed 500K
If you send works that have been previously published, mention the publication and be sure that you have the permission of the original publisher
Include your full name
You may send a short bio if you wish
I reserve the right to not publish a submitted work; I try to respond to all submissions but this is unfortunately not always possible for me due to other commitments
and all forms of visual art in formats presentable online