I'm writing a scraper in node. Is there a module out there that will allow me to work with css selectors?
Look at the excellent jsdom, and specifically this section, where it shows how you can leverage jQuery in Node to scrape HTML documents, thus using the CSS-like selectors that jQuery offers.
If all you need is a module that allows you to use CSS selectors, I'd suggest having a look at sel.
It supports CSS4 (!) selectors already (at least in parts), is smaller then Sizzle (jQuery's selector engine), and focuses on one task instead of doing everything somehow.