Skype / SIP phone adapter suggestions

Im looking for an adapter to use with my regular phone (preferably an
adapter that plugs in directly to the network without having to be
plugged into the computer) but one that supports both standards (skype
and sip). Does such a product exist???

Since the provider's rates are different based on where you are calling
to, do these adapters allow you to have more than one SIP provider at a
time?

Also, in case Google ever offers a 'phone out' service, does GoogleTalk
currently use a non-standard protocol?

benn686@hotmail.com