The best way is getting referrals but there is also bidvertiser which is very similar to adsense. they are all easy to sign up for. its also a matter of advertising relevant things about your blog or else people wont click them or be interested.
The best way is getting referrals but there is also bidvertiser which is very similar to adsense. they are all easy to sign up for. its also a matter of advertising relevant things about your blog or else people wont click them or be interested.