This one is right from their press release:
$1 express bus service’s popularity drives expansion Special FREE travel for one week is offered!
NEW YORK (March 25, 2008) – Megabus.com, successfully serving more than 900,000 passengers since April 2006, today announced the expansion of its low-cost, intercity express bus service to the East Coast. Beginning May 30, East Coast residents can travel for as low as $1 from New York to Boston, Washington, Philadelphia, Baltimore, Buffalo, N.Y.and Atlantic City, N.J. in the United States; and Toronto.
Passengers can begin booking today at www.megabus.com http://www.megabus.com/> for all cities except Baltimore (coming soon-pending stop location).” Megabus.com will offer up to 55 daily departures from New York. Customers are encouraged to book arly to secure fares as low as $1 and will pay competitive fares the closer they book to the day of departure.
Megabus.com is offering all fares booked to depart during the first service week of May 30-June 5 FREE, as an introductory rate (50 cent booking fee applies).