[Rooster61]

Interesting that the size of the ice is not mentioned. I find large pieces of ice to be ideal as they cool the drink for longer yet don't overly water down the drink due to less surface area melting off.

Also, I HATE when bartenders add too little ice to shaken drinks and end up shaking it to oblivion. Makes me not want to order drinks from that particular bar.

[Wojtkie]

It does make a difference. The big rock ice is great for whiskey and scotch the reason you mentioned; keeps it cold with minimal dilution. Crushed ice is great when you want dilution, like in a mint julep. It really depends on the style of cocktail and personal preference.