Your forum looks very clean.. Replace the phpbb header with your own header. Good luck with the site!
The site is not bad, you should work on the header, I viewed the site in firefox 3 and the body of your template is slightly overlapping the text in your header, you should fix this.
The theme and colors look ok but you might want to improve on the seo part and make it visible to search engines. The title doesn't suggest anything which means that you are wasting opportunity to insert valuable keywords there.
Nice layout and scannable content. Pink is a warm, active color so that it matches your site's theme but I would prefer yellow or red instead, as I find more solid colors appealing.
It looks good .. You must add a section for "Rules and suggestiions" for this kind of forum as jokes and other things can lead to spam as well