For information about the Libertarian party, see the party's website:
http://www.lp.org/

The libertarian magazine Reason is well regarded and influential in the current libertarian community. The magazine posts all its content on its website, so it is definitely worth a look:
http://www.reason.com/

Advocates for Self Government is a Libertarian outreach organization. To find out if you might be a Libertarian, take the "world's smallest political quiz" at http://www.self-gov.org/.