There is no credible news about a second season yet.
There won't be any news until most likely April, but it could be as late as June.
We won't see a season 2 (if or when the make it) until October 2009.
BUT... before you freak out, consider this: The longer we wait the better the chance for a season without fillers. Manga takes longer to produce then Anime so the last thing a fan would want is the anime to catch up to the manga before the manga ends. Filler is the enemy.
As for news about a second season. Keep checking here, as soon as I know, I'll post it.