where do you park your domain?

I have some domains park on sedo.
But now the traffics and page rank of the domain goes down.
where do you park your domain?

Domain parking refers to the registration of an internet domain name without that domain being associated with any services such as e-mail or a website. This may have been done with a view to reserving the domain name for future development, and to protect against the possibility of cybersquatting.