I wrote an article for Layers Magazine that was published in their September 2008 issue about some steps every photographer can take to help protect their copyright when putting their photos online. I’m happy to report that Layers has put the full article online for all to read: Protecting What’s Yours.
I’ve added a great link to the comment section of that article that has a wealth of information about how to register your copyright online, so feel free to post more questions over there and I’ll do my best to follow up with answers when I can. Also note that as of August 1 the copyright office will adjust some of its fees.
I look forward to hearing from more of you!