the problem with that would be that the 770 would have to be connected to your phone all the time ...
But otherwise I think that gnokii offers this feature through it's library ... now you only need a GUI
BTW I've cooked up a little app that acces the gpe contact database & allow you to dial a number or send a sms to it through gnokii ...
Anyone willing to try it out (no deb yet but it's coming ...)
O Fred