According to The NPD Group, a leading marketing information provider, U.S. retail sales of video games rose 32 per cent for the month of March. NPD analysts primarily attribute the rise in sales to the late February release of the highly anticipated Gran Turismo 4, as well as "an improved suppy of video game hardware". This "improved suppy" refers to consoles which were in short supply over the holiday season (PS2, Xbox, and Gamecube), along with Sony PSP, which was released on March 24th. In the seven days the PSP was available for the month, 620,000 PSPs were sold, along with 1.1 million PSP games.
Check out the US Console Games Chart for March 2005

US Console Games Chart for March 2005 (Compiled by the NPD Group)

1. Gran Turismo 4 (PS2) Sony Computer Ent.
2. EA Sports Fight Night Round 2 (PS2) Electronic Arts
3. Devil May Cry 3 (PS2) Capcom
4. Star Wars: Republic Commando (Xbox) LucasArts
5. God of War (PS2) Sony Computer Ent.
6. MVP Baseball 2005 (PS2) Electronic Arts
7. EA Sports Fight Night Round 2 (Xbox) Electronic Arts
8. Brothers in Arms: The Road to Hill 30 (Xbox) Ubisoft
9. Tekken 5 (PS2) Namco
10. Tom Clancy's Splinter Cell Chaos Theory (Xbox) Ubisoft