libguestfs 1.0.0 is out, sources and binary RPMs here.
I also added Ruby bindings:
$ irb irb(main):002:0> require 'guestfs' => true irb(main):003:0> g = Guestfs::create() => #<Guestfs::Guestfs:0x7feab981b630> irb(main):004:0> g.add_drive("RHEL52PV32.img") => nil irb(main):005:0> g.launch() => nil irb(main):006:0> g.wait_ready() => nil irb(main):007:0> g.lvs() => ["/dev/VolGroup00/LogVol00", "/dev/VolGroup00/LogVol01"] irb(main):008:0> g.pvs() => ["/dev/sda2"] irb(main):009:0> g.vgs() => ["VolGroup00"] irb(main):010:0> g.list_partitions() => ["/dev/sda1", "/dev/sda2"]