This book has recently come out in response to people (like Steve Chalke and Brian McLaren and others) being against the idea Jesus was punished by God on the cross.
It is supposed to be THE book of our generation! It looks awesome, and you can even get a load of free talks and a couple of free songs from the website! Please buy and read it, is is SO important we understand these issues.
It is such AWESOME stuff...
http://piercedforourtransgressions.com/
UPDATE 15/16 Aug 2010:
Sadly the above link appears to have expired.
Here's some more helpful ones about the book that counters these attacks on the gospel and giving excellent biblical grounds to this life giving doctrine/truth that Jesus took all the punishment we all deserve (for rejecting God's rule in our lives and living our own way), so we can be forgiven and accepted by God if we trust Him, in: 'Pierced For Our Transgressions'. God's love is SO amazing, that He would do this for us!:
A helpful short review/summery.
IVP has the contents, foreward by John Piper and exert from the introduction on their site.
Amazon reviews/page
Also, see this excellent blog post to explain what this debate is all about. I think we should pray for Steve and Brian et al to repent and know the true gospel. People saying things like this about the cross have occurred ever since Jesus was around, it is not new.
