before 2.0
-----------

vgexport
vgimport
snapshots
pvmove
device-mapper support for 2.5 kernel series
review FIXMEs
extra validation & full consistency checks in format1 with LVM1
partial activation (aka VG quorum)
error message review
locking during metadata changes
format2 with atomic transactions
bidirectional format1/format2 migration tool
persistent minors
statistics target and tool support
review tool exit codes for LVM1 compatibility

before 2.1
----------

e2fsadm
lvmsadc
lvmsar
pvdata
vgsplit
vgmknodes