I like your use of capital letters. Sometimes people overuse it, and it really ruins the effect...but it's great here. The poem is also really meaningful.

xD I loved the beginning.

don’t step on the crack,
or you’ll break your mothers back

It's kind of a universal way to start off. It appeals to plenty of people because most everyone has heard the saying, /of course/. ^_^ I think what I really liked most about it was the blunt, rough transition from that phrase to the next:

but when i look at the cracks in pavement,
Crude, Manmade, Dried Piles of Sludge,
i see no superstition,
simply life, triumphant.

You jump into your point so quickly. Which is good since the poem is pretty short, after all.

And one thing I wasn't positive I liked or not was the caps. You only capitalized "Crude, Manmade, Dried Piles of Sludge... Slime". I'm a little 'iffy' about it, but I think for the idea of the poem, it works. It emphasized your thoughts without using loud formatting. And I think that if you had've used lots of italics/bolds, it would've been too much. ^_^

Overall, I liked this poem a lot. The general idea and everything. Thank you for sharing! ;)