Encarta gave up arms, and Britannica is struggling.
Wikipedia is more accurate and rapid than a random search, but it definitely should not be the last word on any matter but rather be a starting point to familiarize with terms and what to search for, and that is the best way any encyclopedia can be anyway, a starting point.
I also love that there are at least 2 solutions for offline use:
http://www.wikitaxi.org/delphi/doku.php/products/wikitaxi/in...