Multilevel Models
Multilevel Modeling
Multilevel Modeling Resources (UCLA)
Hierarchical Models Project (UoM)
MLwiN (free tranining version)
HLM (free student version)
Joop Hox's Webpage
Hox' book (Applied Multilevel Analysis:1995)
Goldstein's book (Multilevel Statistical Models 1999)
Goldstein's book chapters and data (Multilevel Statistical Models 2003, 3rd)
Software from Designing Multi-level Studies (Jake Bowers)