GigaOm reports that SIPphone is introducing a new product called Gizmo Call that will enable users to make VoIP calls from any browser that supports Flash. I use Gizmo Project to make Voip calls on my Nokia 770, and it works just great, so I'll be trying out Gizmo Call as well. Unfortunately it looks like Gizmo Call is not quite ready for prime-time, as OM says that the service is not yet publicly available.
Go to Gizmocall.com to see more about the new service when they release details. For now, the site is password protected, so check back soon.