Dictionary.com, Thesaurus.com have it right

Their "Dictionary", "Thesaurus", "Reference" links across the top work in the way I expect. When I type a new word into the box, I don't have to "Submit" before I can switch to a different tab. Unlike other sites, where my input is ignored if I click a link, it actually reads the input from the text box even if I don't click the submit button. Good job, Reference.com.