I agree that you don't need a new domain. You already have a well known domain and brand name. Just create a sub-domain like blog.tommys-bookmarks.com.
Wordpress is the best blogging software. Its pretty easy to install. I think it's also the most flexible with regular updates and new plug-ins.
There are a lot of free wordpress themes, which you can tweak to fit your needs. Then once you've got things going and you know exactly what you want to do, there are tons of designers that can do a custom wordpress theme.
As I mentioned before, you don't need to update every day. Especially if you're targeting a niche like adult webmasters. What most important is that the posts be informative and useful. Some of the best blogs I read are only updated a few times a month.
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