Twitter

Best Twitter search engine http://www.filtertweeps.com¬

Twitter key characters http://thenextweb.com/TwitterKeys/keys.php

Twitter Search widget

Twitter search/profile/faves/list widget

       features: {
         avatars: true, // defaults to false for profile widget, but true for search & faves widget
         hashtags: true,
         timestamp: true,
         fullscreen: false, // ignores width and height and just goes full screen
         scrollbar: false,
         live: true,
         loop: true,
         behavior: 'default',
         dateformat: 'absolute', // defaults to relative (eg: 3 minutes ago)
         toptweets: true // no longer seems to have any effect. Use the modification below to show all Tweets
       }

Modifications

To ensure that all Tweets appear, rather than just the top tweets, modify http://widgets.twimg.com/j/2/widget.js, and host it locally to change ...
  if(!this.runOnce){this.url+="&result_type=filtered"} to...
  if(!this.runOnce){this.url+="&result_type=mixed"}
as shown in https://dev.twitter.com/discussions/8088¬

Wildcards * and ? do not seem to be implemented

  Possible extra search terms