Barcelona won the title for the first time in 6 years. Considering the clubs history and recent years filled with success it's hard to imagine this league title was also their first trophy since the 1998-1999 season.
This was an important season for many other reasons. It was the debut season of Ronaldinho who would go on to be included in the FIFPRO XI that season. He would also go on to be crowned FIFA world player of the year (2005) Barca would sign one of the coldest Bagsmen of all time Samuel Eto’o who was also a part of the FIFPRO XI.
This would be the debut season of the kid that would grow to be an icon Lionel Messi. And who could forget Ronaldinho’s goal vs Chelsea at Stamford Bridge in the Champions League. (go youtube it, even if it's just for the nostalgia).