There is a new patent search tool available called Xyggy Patent Search.  It has a number of unique features which users may find useful.  Here is a summary of some of the features:

• Drag and Drop search results into the search box
• Drag multiple patents into the search box
• Toggle on/off keywords in the search box
• Remove items by dragging them out of the search box

Xyggy patent uses all available information within a patent to find similar patents.  In other words, rather than basing the results on word frequency of text-search, Xyggy patent ranks the results based on how similar the results are to the query patent(s).  It appears to be a useful new tool.  You can try it out at http://www.xyggy.com/patent.php.  I have also included Xyggy patent in the drop down search menu. 

In addition, Xyggy also offers a legal search of court cases.  The legal search is in beta status and covers US Supreme Court [Reporter U.S.: 1–544] and US Circuit Courts of Appeal [Federal Reporter F.2d: 178–999 & F.3d: 1–491]. Case coverage is incomplete for recent years.  Xyggy legal search is at http://www.xyggy.com/legal.php.  I also included it in the Case Law sub-menu of the US menu.