Newgrounds.com — Everything, By Everyone.

Q: Are there any general submission guidelines?

A: Yep. Here they are:

We do not seek movies that are racist or excessively pornographic. Artists should use their best judgment, based one what they see here at Newgrounds.
We do not want "demos" that have no functionality. If an artist has a decent demo then he should consider posting them to the Alphas section. If we see multiple entries in the Portal such as "Crap Movie v0.3" then "Crap Movie v0.5", we will delete them because they are annoying.
We despise movies that auto-redirect or auto-spawn windows to other sites. If people like a submission they will click on a link that takes them there anyway. If we catch a user using an auto-redirect or auto-spawn, the offending NG account may be deleted.
Artists should not beg for high votes. If a comment reads "Vote a 3 or higher and I'll make more" or something similar, we will most likely delete it. Also, ploys like "Vote a 5 if you support Napster!" warrant deletion too.
Users MUST NOT upload movies that they did not make. We will ban the IP address of any offenders and Newgrounds suddenly won't be so fun anymore. Also keep in mind that a user uploading a movie to the Portal is making a legal claim that it is their original work. It is a good idea to put a Newgrounds validated e-mail address somewhere in the beginning or ending of a movie so we can easily determine if the movie is stolen or not. We also love it when users put the NG tank logo in their movies. Check out the NG Preloaders page!