As Julien Sharp noted recently, “Getting followers on Twitter is relatively easy, but what is really important in making Twitter a worthwhile experience is the type of followers you get – and the type of “Twitterers” you yourself follow.”

Sage advice but easier said than done… until now. WhoShouldIFollow is a Twitter mash-up that looks at your tweet-stream and, comparing it to all the other streams, picks out a list of people tweeting the same kinds of things you are. This is the best Twitter mashup I’ve found and looks to be a time saver.