Sorry, but I disagree with your choice of adjectives.
You are reducing what happened today to a mere "bug", which is the way Google (or developers) would look at it. Instead, approach it from the user's POV. Having your financial, personal, professional, secret or illegal (yes, I'm sure there will be that too) communications sent to multiple random people is more than just a bug.
I agree GTalk is "really, really good" like you say, but then what happened today also should "never, ever happen".
Consider that statistically it can happen to any other messaging service provider. And switching to other instant messaging service won't offer you additional protection due to that the core problem (it is impossible to guarantee zero bugs without huge overheads) is the same for all services.
You are reducing what happened today to a mere "bug", which is the way Google (or developers) would look at it. Instead, approach it from the user's POV. Having your financial, personal, professional, secret or illegal (yes, I'm sure there will be that too) communications sent to multiple random people is more than just a bug.
I agree GTalk is "really, really good" like you say, but then what happened today also should "never, ever happen".