I love all sports. I particularly love the "alternative" leagues of the 1970's and early '80's. These are some of the sites dedicated to that category of leagues.
http://www.tampabayrowdies.com Lots of great Rowdies photos.
http://www.timbersfanpage.com/ Lots of Timbers photos. I "borrowed" a few for this site.
http://www.soundercentral.com/MuseumLobby.htm Nice NASL Sounders and MISL Stars photos.
http://www.ftlauderdalestrikers.com/ Nice site dedicated to the Strikers.
http://davebrett.com/-Dave has an amazing collection of NASL DVDs. He will trade or sell you copies. All his stuff is first rate.
http://www.nationalsoccermuseum.org/Merchant2/index.htm
http://www.oldfootballshirts.com/en/index.php This site is primarily European jerseys. They have some NASL jerseys and are adding content all the time. I visit this site every couple of weeks to see what they've added.
http://www.soundercentral.com/MuseumLobby.htm Nice NASL Sounders and MISL Stars photos.
http://www.geocities.com/feverfan78/ Philadelphia Fever data
http://www.oursportscentral.com/misl/ General MISL data
http://remembertheaba.com/ This is a great website. I've visited this site every couple of months for years. I never get tired of going to it.
http://abamemorabilia.com/ -A lot of pictures
http://www.charlottehornetswfl.com/ Lots of Charlotte Hornets pictures
http://www.wfl1974.com/index.html Everything you need to know about the Birmingham Americans and Vulcans.
http://www.worldfootballleague.org/ World Football League statistics.
http://www.dropthepucks.com/sotg/ This is a commercial site. I'm not affiliated with it in any way. I simply admire the site. It is well organized and I always learn a lot when I visit.
http://www.mlbstyleguides.com/ This is also a commercial site. I think most jersey collectors are sports fans first. Most of us collect or will collect multiple sports. I bought their guide to baseball jerseys. It is well worth the money.