Browsed about on this site some months ago when XNA started up, but for some reason it dropped completely of my XNA radar.
Back with a vengence now with Beta2 tutorials and guides to creating a full 3D hockey game, Bill Reiss brings a good depth on game deelopment and collision (one of my personal hates)
Bill also brought us Dr Popper an excellent game which probably helped me in places with my own. Find the game and Full source on the site.
One to give a look!