While the domain name .tv is the top-level domain for the islands of Tuvalu, any person may register a .tv domain name (expect for reserved names like .com.tv and .org.tv). The .tv domain name is popular because it is an abbreviation of the word "television" - it is the best way to announce that your website has video or other rich media content, like animation.
Here's a list of .tv websites.
The .tv domain is not just for the entertainment industry. For example, a .tv domain name may be ideal for websites with how-to videos, promotional materials, training and educational content.
The .tv domain is currently operated by dotTV, a VeriSign company. However, to register a .tv domain name, you will need to do so through a .tv registrar, ie. Doteasy.com.