Yes - but pretty much whatever you add is not going to be used by
everyone. If I was doing something with analogs, I might not be using
the switches or all the leds, or maybe not the RS232. I just thought
that a few cents for a simple Opamp might be of use ~30% of the time.
Maybe I'm biased toward analog interfacing but I don't generally find
"digital only" projects have the same appeal.
Your call.

Re the  prototype size, you'd probably have as much experiance with
this as anyone. I generally don't use it as I prefer to use an
external circuit to avoid damage or commit to a "valuable" resource as
 I may want to try a different project without wanting to strip
everything off.
50 double collumns sounds quite generous particularly, as you say, the
leds & switches & RS232 are already taken care of.

I'd say basing on 10% to 15% projects being too big to fit is quite
reasonable especially as cost is going to be a major factor.

RP


> This sounds like it's getting more and more application specific.  Many
> projects might not have any analog at all.  Would this not be better served
> by providing a generous prototype area that can be used exactly as needed by
> any project?  In other words, would you find it objectionable if the answer
> is "that's what the prototyping area is for"?
> 
> That brings up the question of how much prototype area is enough.  I looked
> at the protoboards we have lying around that have been used many times to
> quickly implement temporary PIC projects.  The vast majority of the time,
> these projects fit on one board.  The ones we use have 47 double columns,
> which is a little less than 5 inches wide.  I figured 50 double columns
> would be good enough for most cases, especially considering that the PIC,
> power supply, RS-232 interface, and debug LEDs don't eat into that budget.
> I'm figuring that 10% to 15% of projects are too big for this board is about
> right.  Otherwise it would be too expensive and therefore not applicable at
> the low end.  The question is how big is about right?

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