It's now known that there are dozens of venomous lizards. The announcement of true venom in Komodos led people to look closer, and now they're finding it in other monitors (probably all of them), bearded dragons and other agamids, and in iguanids too.

According to Fry, "the “venom clade” includes the iguanians (of which chameleons are a subset), the anguids (legless and alligator lizards), and the monitors."