In the Accessor Delegate example you have:
delegate(StockQuote q) { return q.date.price; } );

which should be:
delegate(StockQuote q) { return q.price; } );

I do like the example. Delegates continue to elude me and this helps.

your remark about a a large number of accessors is correct. it doesn’t feel right to pass 10 accessor delegates parameters. But you can fix it by combining this approach with .. interfaces.
(I’m not a c# expert so here is a java equivalent)
library:

interface ChartInfo {
int getX(T o);
int getY(T o);
}
Chart CreateChart(List items, ChartInfo info);

client:

ChartAPI.CreateChart(quotes, new ChartInfo() {
public int getX(StockQuote q) {
return q.date.DayOfYear;
}
public int getY(StockQuote q) {
return q.date.price;
}
});


Now you can add more methods to ChartInfo interface which will still look reasonably clean.

Also to optimize a number of calls you can do

interface ChartInfo {
Point getPosition(T o);
}

Cheers,
Vitali