caffeine drip. Answering your questions by number: (1) Yes, offering information is a service; you don't have to make traditional sales to be "in commerce." (2) We're not sure what you mean by "business registration" (we assume you haven't filed a DBA or incorporated or formed an LLC). In any case, it doesn't matter; individuals can register marks. It's easy to transfer from one entity to another, just be sure to notify the USPTO of the assignment. (3) You should register the term that best identifies your services to the public -- which is typically the name of the blog. (Check out our entry about registering blog titles as trademarks.) (4) You should register the blog name or words in standard character format. We don't think there's much sense in registering a stylized version of the name -- especially because you may later change the appearance. If you have a unique logo that differs from your name, you can register that but that should be a low business priority, at least until the online business is doing well enough to justify the $300+ registration fee. Here's more info on registering trademarks.