The PEAR blog has a recommendation for those that might not have updated their package udage in a while - there's been major changes in many packages, but two in particular.
We've had 60 releases since July. While most are often minor improvements or bug fixes; a number of packages really stand out. Net_DNS2, and HTTP_Request2. Each of these packages represents the second edition of their respective APIs; each having been honed over time to a point of stability.