According to OWL, at Purdue University, the rules have changed (yet again!)
"MLA no longer requires the use of URLs in MLA citations. Because Web addresses are not static (i.e. they change often) and because documents sometimes appear in multiple places on the Web (e.g. on multiple databases), MLA explains that most readers can find electronic sources via title or author searches in Internet Search Engines."
HENCE, you could cite the Dashiell Hammett page here as
Marling, William. "Dashiell Hammett," detnovel.com, (today's date) web, 4 December 2009.
However, OWL also adds:
"For instructors or editors that still wish to require the use of URLs, MLA suggests that the URL appear in angle brackets after the date of access. Break URLs only after slashes.
Aristotle. Poetics. Trans. S. H. Butcher. The Internet Classics Archive. Web Atomic and Massachusetts Institute of Technology, 13 Sept. 2007. Web. 4 Nov. 2008. <http://classics.mit.edu/Aristotle.html>.
So if your instructor requires this long form, your entry should read:
Marling, William. Hard-Boiled Fiction. June, 2007. Case Western Reserve University. (Date you visited here.) http://www.case.edu/artsci/engl/ marling/hardboiled/Citation.html*
*Please note: the italicized phrase should be the specific pagename that you are quoting.
** This site was updated on 4 December 2009