The Tools for modeling and the pandemic bf2 xsi addon :

Modeling software trials + pandemic addon
XSI Key Map

The tutos for modeling :

Texturing:

Weapon Textures tips by RogueKnight

Animation:

Create a walk anim loop
Animated Prop

Capes/Clothes:

Cape/Cloth informations

Collisions:

Stock Models collisions primitives references for capes and clothes

Multiple subjects:

ANDEWEGET 's Tutos
All xsi questions thread
Epifire ' s tutos
Icemember with XSI

Kitbash:

Kitbashing
Kitbashing a new weapon and export it