[geeks] Digitizer tablets?

[Mouse]

I'm finding it would be useful to have a digizer tablet with a pen
input.  (I have one with a puck for input; it's a Summagraphics.  But,
as good as a puck is for some use cases, there are others for which a
pen is better.)

What little I've managed to find seems to indicate that Wacom is the
big name these days, but they seem to have heavily bought into the
"just use our SDK" paradigm rather than documenting their hardware's
interface - their SDK probably won't run on my machines and, unless
they provide source, I wouldn't use it even if it did.  (And their
website seems to be designed to keep people from actually reaching
them.  Perhaps I've missed something.)

So, anyone know anything about a tablet with a pen UI and a documented
interface to the host?  While I'm wishing for unicorns, preferably one
I can buy new at a brick-&-mortar in Ottawa (Canada).

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