index or not?

Hi,
I have that youtube cloon website

after a while there are lot of indexed pages for all the tags on my site and since a few days I have some good organic traffic.

I'm a little affraid because of content duplication...(yeah the content is already duplicated)

because the content from the videos in the tag list is the same like on the video details, I'm asking me which pages I need to index at google:
all the tag pages (plus all the details pages)
example: http://www.funniestvidz.com/video_tags.php?tag=funny

or only the details
http://www.funniestvidz.com/watch.php?video=2BN0a5UjQlE

In would aim to get the tags indexed rather then the pages, but prevent neither.

So xml sitemap with the tag pages, for submission, don't worry to much about dupe content. Content that is duplicated on your site is not an issue Google just chooses which to show (you can influence the choice via sitemap) on a search but other then that doesn't give any further penalty.

I noticed that its easy for Google to index all the tags (3000 now), but didn't see so much detail pages.

I guess I will try that for a while (with and without index)

actually like to have only the details index because the content on the tags page can be often the same (many videos have the same tag)