A couple of comments.. more to come..

- when you create an adspace and you type in the webpage where its going you need to type in "/webpage.html" not "webpage.html". It should add the "/" in automatically..
- please don't use iframes to show the code :-(
- alternative ad options so if you have no one bidding on your website (a reason for no iframes)
- Statistics - Data column(s) for axis #0 cannot be of type string (I presume when someone has no data and you look at their stats)
- no gif's please or people will make horrible animated gifs (or do you check them if they are?)
- no forgot password.. I presume you are storing passwords in one way encrypted format only..