$ pear list
INSTALLED PACKAGES, CHANNEL PEAR.PHP.NET:
=========================================
PACKAGE                   VERSION    STATE
Archive_Tar               1.3.1      stable
Benchmark                 1.2.2      stable
Cache_Lite                1.4.1      stable
(...)
XML_RSS                   0.9.2      stable
XML_Tree                  2.0.0RC2   beta
XML_Util                  1.1.1      stable

$ pear list-all
ALL PACKAGES:
=============
PACKAGE                          LATEST      LOCAL
pear/APC                         2.0.4                  Alternative PHP Cache
pear/Cache                       1.5.4                  Framework for caching of arbitrary data.
pear/Cache_Lite                  1.4.1       1.4.1      Fast and Safe little cache system
(...)
pear/Services_Google             0.1.1                  Provides access to the Google Web APIs
pear/Services_Technorati         0.5.5                  A class for interacting with the Technorati API
pear/SOAP                        0.8.1       0.8.1      SOAP Client/Server for PHP
pear/SOAP_Interop                0.8         0.8        SOAP Interop Test Application
pear/UDDI                        0.2.0alpha4            UDDI for PHP
pear/XML_RPC                     1.3.0RC1    1.3.0RC1   PHP implementation of the XML-RPC protocol
pear/XML_SVG                     0.0.3                  XML_SVG API

$ pear list-upgrades
 pear.php.net Available Upgrades (alpha, beta, stable):
 ======================================================
 Channel      Package                 Local          Remote         Size
 pear.php.net PEAR_PackageFileManager 1.5.0 (stable) 1.5.1 (stable) 46kB