By one count, Twitterfeed is the third largest Twitter client, being used by 6.5 percent of all Twitter accounts and at one point was generating 9.2 percent of all Tweets. Nobody uses Twitterfeed to consume their Twitter stream, so it is not really a client like TweetDeck or Seesmic Deesktop. However, a lot of people use it to populate their own Twitter account with messages.
The new Twitterfeed now includes a basic analytics dashboard which brings in bit.ly data so publishers can see how much traffic is coming to their site from Twitter. They can also compare that side-by-side with traditional Feedburner stats to see where most of their redares are coming from and which source is growing faster.
Twitterfeed is also adding more sign-in options. In addition to OpenID, it now accepts usernames and passwords from Google, AOL or Yahoo accounts. But one big drawback the service still needs to address is the lag time between a post hitting a feed and the corresponding Tweet hitting Twitter. It can still take a half an hour between those two events. When you are talking real-time, that is 30 minutes too long.