"As of now, the library integrates all twitter API features and is supporting Basic Authentication aswell as the much requested OAuth!"

AS: added OAuth Support
AS: added getHomeTimeLine
AS: added getRetweetsByMe
AS: added getRetweetsToMe
AS: added getRetweetsOfMe
AS: added retweetStatus
AS: added statusRetweets
AS: added Geo Tagging feature to updateStatus
AS: added searchUser
AS: added description property to ListData
AS: updated StatusData to include Retweeted Statuses and Geo Information
AS: refactored GET Request argument passing
AS: fixed a bug when parsing SavedSearchData (thx Ken)
AS: removed deprecated methods, sendTweet, destroyTweet, getSingleTweet, getReplies
PROXY: Fixed an Image Upload Bug (thx Bhargava)
PROXY: OAuth Support

http://blog.swfjunkie.com/2009/12/tweetr-lib-reaches-v1-0b/