With over 22,000 US magazines in over 250 major magazine categories you'll certainly want to research the competitive landscape before choosing your new magazine niche and building your magazine business plan & readership demographics.
MediaSource (www.bacons.com) provides advanced tools to research the media. An alternative to the subscription based MediaSource software is MediaListsOnline (www.medialistsonline.com), a tool to build a list online of publications by category classification and purchase only the group of magazine & newsletter publications that you want to research externally in more detail.
Another resource for analyzing the market is the MPA website which lists the number of magazines by category through 2004. Click here to launch this site location at www.magazine.org.