Subway is the fastest way to get around the city; consider getting a MetroCard.
Many museums offer free admission on certain days; check their websites for details.
Broadway shows usually require advance tickets; book online to avoid long lines.
I have been using it now for 3 months and it saves me so much research. Reduces the need to call and double check every time.
How did I not know these places existed?! Atly's scoring is a lifesaver, now I can finally find THE spot without wasting time Googling my life away.