Fri Mar 02 2012 09:12 Beautiful Soup 4 Beta 10:
Hey, two in a row. The "release candidate" thing was a lie; the big change is that I ported and incorporated Simon Willison's soupselect project. So you can now combine the Beautiful Soup API with CSS selectors. Except I just realized that I ported an old version of the code, so I'll be doing another release.
Anyway, here it is in the BS4 docs.
under a Creative Commons License.