After jumping the gun in late June with a Lion compatible firmware (which was later withdrawn) Netgear have a new Lion compatible firmware.
I will be testing it soon – contact us if you have a ReadyNAS and need Lion workstations to connect…
Older ReadyNAS users with NV, NV+ and other Sparc system will have to wait a little longer.

Thecus released an update last week, still waiting on Synology to release a final version.