I'm at a loss, both at how awesomely intriguing Diagram is, and as to what they are exactly. So far as i can glean, they are an online magazine dedicated to writing and poetry.
"We're interested in representations. In naming. In indicating. In schematics. In the labeling and taxonomy of things. In poems that masquerade as stories; in stories that disguise themselves as indices or obituaries." www.thediagram.com
Me being more graphically orientated, I prefer the visuals on the site more than the writing on it's own, the mixture of existing diagrams with unrelated yet somehow meaningful text is brilliant.