I had the same problem... what I did was I went to Cleo's site and looked through the sites accepted there and you can get a pretty good idea of what will be accepted.
Stick to these rules:
1. No hardcore on the main page
2. 3 outgoing links per page
3. Under 12 recips
4. atleast 20 pictures
5. Stay away from low quality pictures
6. pics 500 pixels on the long side minimum
7. no full page ads
8. design so that your site is viewable on 600x800 res.
9. No blind links or banners that say "Enter Here" (just write some text above or below explicitly telling the surfer that clicking on the banner will lead them to another site)
10. Follow their specific rules on descriptions and title.
Shall we call it "The Ten Free Site Commandments" lol.
The only reason you wont get accepted if you follow those rules each time you make a new free site, is if you submit under the wrong category. Usually the reviewer will tell you which category they prefer to see it under so you can just go back and switch the recip.
