AdSense

• Your site has to be 6 months old -
Now they ask for old sites which are indexed in search engines already. So You have to wait if your web site is not old ehough. Maybe if you have a old domain that might work.
• Your site must be complete -
You need a full complete website. There should not be half developed pages or under construction pages. Just make a Blogspot and put some content they will accept it. Or even if you have a simple 5 page site.
• Privacy Policy and Contact page -
You must add a privacy policy to all your web sites which has AdSense Ads. They have make it clear in their new TOS. You can find Free AdSense privacy policy generators online. Also Add a Contect page so site would look more professional.
• Unique Content -
Use some Unique content at least for the site you going to use applying for AdSense. They have it mentioned among their guidelines.
• No Adult or Gambling sites -
You can not use AdSene for Adult or Gammbing sites. As for Adult sites, their policy is like "If you cant show it to your mom then don't use it !". No need to tell Warez content are out of question too.
• No others Ads which look like AdSense Ads -
You can't use other Ads which has the same look as AdSense ads like same color and format. Basically other Ads shouldn't confuse visitors to mistook them as Google AdSense ads. So if you have them in your site better remove them even before applying for Google AdSense.