I have a website that I've been running for several years. A couple months ago website with a identical URL with the addition of another word (being Podcast) has started covering topics similar to my own website. They not only have a website but are also on YouTube, iTunes, etc, which my site is as well, and again they're using our name plus the name Podcast. We've previously had a podcast using the same name as their website. It's this lack of a difference in the name and also the fact that they cover the similar topics that I'm afraid visitors and other business that I work with are confused by which website is which. I haven't applied for a trademark on the name. Clearly because of this incident I should. But I have a question on what exactly I should trademark: The name of my website is several words. I sometimes write the name with spaces and other times without, either way you read it the same. Currently my competitor writes the name with spaces. Should I trademark both ways, with spaces and without? Do the spaces matter for a trademark? Ultimately after the trademark I want to send a cease and desist letter to the other website.