"The utility of an operating system is not proportional to the number of components whose development has been paid for (paid in developer time not dollars in the case of Linux), but is instead proportional to the number of connections possible between those components" [here]. This is the OS version of Reed's Law. It's also why the first crop of Groove tools are bad. How many ways can you connect to a chat tool? (Zero, probably).

Pinboard is a little tiny bit open: there's a generic data-model delegate (the main recordset engine), and a schema, and a reasonable amount of import/export/clipboard support. Right now there's a catch-22; there aren't many good ways of connecting into tools, so nobody has yet invested in building clients for that linkage. (Apart from the yourapp10 sample, that is).

And, what does this have to do with Lotus Agenda? Quite a lot, if my current next set of pipedreams pans out.