There's an effort by qa to get packages ready for PEAR2.
See mailing list entries for more info.
pear convert
mv package2.xml package.xml
pfm
(PEAR_PackageFileManager_Cli)pear install package.xml && pear list FooPackageName
svn commit -m “Updating to package 2.0” package.xml
pear package
Note pearweb can't tell when you've got both package.xml and package2.xml, so some packages might show up wrongly. Quickest fix?
mv package2.xml package.xml && cvs remove package2.xml