Wow $100 for me wasn't THAT hard... took about 20 days to get that high... But of course, it's hard to get that much on blogs, personal sites, etc.. I think the best way is to have a site with potential, and the keywords that are interesting. That'll bring up the chance of making money from ad clicks..
wow! 100$ in 20 days would mean 5$/day . definitely not bad for a new site. but If we leave blogs and personal sites out then only thing thats left are seo sites, professional sites like free music, software, directory. so does that mean that there is not much future in blogs?