There are many websites dedicated exclusively to hosting users' cat videos, such as CatVideooftheWeek.com or LifeWithCats.tv. Both sites offer large searchable databases of cat videos.
You can sign up for an account at CatVideooftheWeek.com to receive a weekly email containing the editors' picks of the week's best cat videos. If you have a good cat video of your own, the site allows you to upload videos to share with the community. Users can also vote on the best cat videos. LifeWithCats.tv allows you to search cat videos by category: cute, funny or inspirational. The site also contains blog posts, comics, and articles.