RarZilla Free Unrar is a great little utility for automatically opening RAR archive files, but it doesn't do much else. Depending on whether that's all you're looking for, RarZilla is either just the tool you need or woefully inadequate.
The program does a wonderful job of unzipping--sorry, unraring--RARs, and it provides three methods for achieving that goal. You can select the "RarZilla!" option from the context menu associated with any RAR file in Windows Explorer, you can double-click the RAR, or you can drag and drop the RAR onto the program interface. To aid in the last one, the program is permanently set to live on top unless you minimize it. We found that annoying, but your mileage may vary. It extracts the compressed files to the same folder in which the RAR lives. RarZilla is squarely aimed at those users who predominantly use the RAR format. Fans of other archive formats should look elsewhere for an extractor or a traditional archiving/unarchiving tool.