PSOFT MOBILE released "egobird" (free), a Twitter search client for the iPhone.
egobird is a Twitter client app that introduces a completely new and pleasant search experience. The app can be used to easily create even complex search queries and organize the results so they can be quickly checked. Users can reply to and quote search results directly from within the app. This makes it a great tool for improving the efficiency of "ego searches" where the user searches for comments about their activities to interact with the people making these comments in order to increase their visibility in that field.