Hi Pepe,

I know that MrExcel has a PowerPivot section frequented by a few of the PP heavy hitters, including Rob Collie. There's also an Excel BI forum at VBAX although it's not that busy as yet, and the same with Ken's ExcelGuru site.

Other than that, I don't know of specific forums (I don't think even MSAnswers has one) but there are a few good blogs out there.