I've attended several of Pragmatic Work's free SSRS webinars and have found them to be really well done. However a quick search shows no SSRS 2005 classes. If you are trying to do advanced reporting on SSRS 2005, I'd recommend that you push for an upgrade to 2008. It is such a huge improvement using the tablix over the matrix (no more InScopes) and the charting controls available in 2008 are so much better.

Mwise