In Old Favstar, if a tweet was favorited by hundreds of people, you could only see the first 300 who faved it. Now, if you view the tweet on it’s own page, you can see everyone who faved it (or retweeted it).
For example: http://favstar.fm/users/iamnotdiddy/status/5828988483
Tip: To get a single tweet to appear on it’s own page, click on the timestamp below the tweet text.