This is a direct link to the US Copyright Office's new experimental search page. I've used this page, it's a lot easier to find things with this. Here's what they say about it:..."Search copyright information by selecting one of the three databases below, which contain records of registrations and ownership documents since 1978.....This is an alternative, experimental search method for short, simple searches and occasional users. You may also still use the traditional LOCIS system. All systems are unavailable 5:00 p.m. Saturday to 12:00 noon Sunday (U.S. eastern time)..."
Also, in October they will have a new search system called "eCO Search."