Don't know about GP, but I don't want to touch any third party. Beyond data concerns, I haven't seen one that would provide me with necessary amount of control (which amounts to being able to run SELECTs against my finacial data and graph them how they like).

Thanks for the link to weboob project, I haven't seen that one. boobank looks much more like something I want to have, though I can't find anything on how it works - how are the banking modules implemented? In particular, are they accessing an API, or just scrapping the bank's page? The reason myself and others are pushing for consumer-open API access is because, while scrapping is something a competent programmer can do (+/- jumping through the increasingly arcane authorization hoops), it's technically against ToS, and I'm personally not willing to risk my bank thinking I'm trying to "hack" them.