From Victoria Song:
Hibari is modern and stylish Twitter client. Hibari allows you to filter out tweets containing topics you don't want to hear about. For example, if you want to avoid mentions of a certain TV show for fear of spoilers, just create a keyword block setting with the name of that show. If you put multiple words into one setting, Hibari will only block tweets that match all of those words. Keyword blocking works great for hiding automated tweets from "tweet blast" promotions and check-in services like Foursquare or Gowalla. Simply add a filter containing the bit of text common to all those tweets. In Hibari, you don't have to monitor a separate timeline to see your most important search results. Check the "Display results in home timeline" checkbox next to any search term and all matching results will begin appearing in your home timeline. We recommend using Twitter's search operators to increase the usefulness of your searches. For example, you can use the minus symbol to exclude a term from your search. Normally, you only see conversations between users you follow. If you'd like to see every conversation involving a certain Twitter user, add a search setting that contains @user OR from:user (substituting your friend's username for user).