Spotlight for currency conversion I know that Calculator app has ability to convert currencies but is it possible to get this shortcut in Spotlight like that:

currency 100 USD to GBP
Well, there is a way, actually. Invoke Spotlight, then type in your text as above. Then use the arrow key to move to near the bottom of the menu, and choose Search Web For... This will do a Google search for your conversion, and you'll get a figure and a graph.