Hi Radu,
You need to tell maven about XWiki's remote repositories as described on
  mvn install yields:
 At revision 3925.
 Macintosh:~/Desktop/xWiki Sandbox/SVN/trunks-users rhadoo$ mvn install
 [INFO] Scanning for projects...
 Downloading: 
http://repo1.maven.org/maven2/com/xpn/xwiki/platform/
 applications/xwiki-applications/1/xwiki-applications-1.pom
 [INFO]
 ----------------------------------------------------------------------
 --
 [ERROR] BUILD ERROR
 [INFO]
 ----------------------------------------------------------------------
 --
 [INFO] Failed to resolve artifact.
 GroupId: com.xpn.xwiki.platform.applications
 ArtifactId: xwiki-applications
 Version: 1
 Reason: Unable to download the artifact from any repository
   com.xpn.xwiki.platform.applications:xwiki-applications:pom:1
 from the specified remote repositories:
   central ( 
http://repo1.maven.org/maven2)
 [INFO]
 ----------------------------------------------------------------------
 --
 [INFO] For more information, run Maven with the -e switch
 [INFO]
 ----------------------------------------------------------------------
 --
 [INFO] Total time: < 1 second
 [INFO] Finished at: Mon Jul 09 21:06:09 EEST 2007
 [INFO] Final Memory: 2M/5M
 [INFO]
 ----------------------------------------------------------------------
 --
 [INFO]
 ----------------------------------------------------------------------
 --
 [INFO] BUILD SUCCESSFUL
 [INFO]
 ----------------------------------------------------------------------
 --
 [INFO] Total time: < 1 second
 [INFO] Finished at: Mon Jul 09 21:06:09 EEST 2007
 [INFO] Final Memory: 2M/5M
 [INFO]
 ----------------------------------------------------------------------
 --
 with the settings.xml updated to latest version, svn up to latest
 revision.
 Am I doing something wrong, or is it just broken?
 Radu