There are lots of sites. Here's a list I made a few years ago. Some of the links are dead now, but most work.

Sites for news articles about men and men's rights and issues:
A daily news source with articles about top stories, as well as content regarding men's rights, father's rights, and other men's issues:
www.mensnewsdaily.com

Humorous and politically incorrect commentary on many issues, by a man's man, Fred Reed. He's like a modern-day Mark Twain:
www.fredoneverything.net/

Angry Harry is pissed about the creeping feminization of society, and he has something to rant about every week:
www.angryharry.com/index.html

The International Men's Network is a site about Men's Rights:
www.mens-network.org/

Manhood Online is an Australian site with articles about men, fathering, and men's issues:
www.manhood.com.au/scripts/...nhome.idc

The Men's Center is a site with an online magazine, and local, national and international resources for men. Of particular interest is their MENSIGHT Magazine, which includes an online library with a large number of texts about men, our issues, and our needs as fathers, sons and brothers:
www.themenscenter.com/

The Men's Issues Page provides links to many relevant sites, research, and statistical data about men:
www.menweb.org/throop/

Menstuff (The National Men's Resource) has a wealth of links, events, groups, periodicals, etc about men:
www.menstuff.org/frameindex.html

The National Coalition of Free Men is a political action group which advocates for men, fathers and men's rights, and has a large national base of men interested in changing laws that discriminate against men:
www.ncfm.org/
And their online e-zine gazette:
ncfm-dc.org/ezine/index.html

The Backlash! is an online men's magazine and page of links interested in the Equalitarian movement, and counter to the Feminist movement:
www.backlash.com/

Home page for Jack Kammer's book "If Men Have All The Power, How Come Women Make The Rules?":
www.rulymob.com/

SAFE is an organization that publishes info about domestic violence against men and women, and supports more sane laws with regards to domestic violence:
www.safe4all.org

The ManKind Project is the web site of another "Men's Weekend" type of event, and includes a great deal of useful information:
www.mkp.org/

(NOCIRC) National Organization of Circumcision Information Resource Centers, circumcision information and anti-circumcision advocacy group:
www.nocirc.org

(NOHARMM) National Organization to Halt the Abuse and Routine Mutilation of Males, anti-circumcision advocacy group:
www.noharmm.org

Choice for Men advocacy group for more and better male reproductive rights:
www.nas.com/c4m/

Sites regarding fatherhood and father's rights in family court:
The Million Dads March is a Fathers' Event dedicated to ensuring that fathering issues receive attention and publicity worldwide.
www.milliondadsmarch.org/

National Congress for Fathers and Children
www.ncfc.net

National Fathers' Resource Center (NFRF) Steve Finstein, Director
www.fathers4kids.org

National Parental Alienation Foundation
www.fact.on.ca/pasrf/info_prf.htm

Center on Fathers, Families and Public Policy, David Pate- Executive Director
www.cffpp.org/

Coalition of Parent Support (COPS), Robert Bennett, President
www.copss.org/

The Fatherhood Project/Families and Work Institute", James A. Levine, Director
www.fatherhoodproject.org

Fathers Raising Children (FRC) John R. Sims, Executive Director
www.frcpgh.org/

Fathers' Resource Center, Inc David Bruer, Executive Director
www.fathersresourcecenter.org/

Search Engine listings for sites of interest to men:

Men's Issues on Yahoo:
dir.yahoo.com/Society_and..._Groups/Men/

Men's Health on Yahoo:
dir.yahoo.com/Health/Men_s_Health/

Fathering on Yahoo:
dir.yahoo.com/Society_and...n/Fathering/

Men's Issues on Google:
directory.google.com/Top/Soc...ple/Men/

Men's Health on Google:
directory.google.com/Top/Hea...sources/

Fatherhood on Google:
directory.google.com/Top/Hom...Fathers/

Newsgroups and Discussion Groups:
Men's issues are discussed on the Usenet at soc.men and alt.mens-rights. Use your Internet Service Provider's access to newsgroups to participate in these online discussion forums.

Annexcafe has a men's newsgroup forum. You can subscribe by using the NNTP server:
news.annexcafe.com and subscribing to the group: annexcafe.men.menbbs

Yahoo Groups has quite a few men's discussion groups, which you can view here:
dir.groups.yahoo.com/dir/Cul...Movement
dir.groups.yahoo.com/dir/Cul...der_Wars

My favorite Yahoo Group for men's stuff is:
groups.yahoo.com/group/Tri...ryMeeting/