Today is the last full day to play original Xbox games on Xbox Live. On Thursday the 15th the servers are being shut down. Respect should be paid to a great service that paved the way for what we have now.
Xbox Live in it's current state (on the 360) and PSN (on PS3) wouldn't be around in their current form if not for the original Xbox Live. If you have any itch to play an old Xbox Live game, now is the time to do it.