When I am online, I quite often see a lot of websites or blogs that do not have any contact information.
And it kind of puzzles me, because I think one of the most important things if you are serious about your site is to be able to communicate with both readers, advertisers and other people who might have questions, offers or suggestions.
So if you have a website: Make sure you put your email address or a contact form on it! How else are people who want to help you develop your going to reach you?
(If you do not want to use your real email address for this, you can create a separate email for your blog. And if you are scared of spam, learn how to "mask" your email on the site itself. This will get rid of automated spam but real users will still be able to figure out what your email is)
(pic from Annahallen)