The best way is to get other similar blogs to add yours to their blogrolls (or links sections). Of course you'll need to do that for them in return. It also helps to register your blog on as many blog directories as you can find. And make it easy for people to figure out what your blog's RSS (syndication) feed is. Make it obvious. Then give them easy ways to subscribe (add buttons, email subscription options, etc.). Feedburner (now owned by Google) is great for this: www.feedburner.com