Google recently announced that its Caffeine search upgrade will be activated following several months of user testing. In August, Google invited users to experiment with Caffeine and provide feedback on the new search architecture that allows Google's search engine to "push the envelope in size, indexing speed, accuracy, comprehensiveness and other dimensions." Internet search engines are constantly upgraded to incorporate new Internet applications and ever-expanding content; read our previous blog entries on Bing's new Twitter search engine and Hyperwords.