There are a couple of basic rules, but remember that the exception will confirm the rule... :
1. use QUALITY content. When surfers see low quality or over-exposed content, they will leave your site fast as light. You have to steal their attention and make them look at your stuff.
2. Avoid banners. Surfers are getting sick of them (especially TGP people). Use original text links like 'Oh man... I visited this university-website and saw the cutest teens on earth... blahblah'; then you make a chance they will click.
3. Avoid freehosts. They have a lot of banners; if people click on banners, they will choose theirs. When you notice that you can afford it, choose for a payhost. It costs money but will improve your clickthrough. But look out : galleries EAT bandwidth !!!!
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