Hey Fu, its started to become an issue with me on my deads so started to become more aware when articles pop up about grip training. I know Gazhole also has some good stuff on his website getlifting.info:
getlifting.info » Get Gripped
Another thing Fu, im going to try out sumo deads next week in the hope it takes a little pressure off the lower back and get a bit more leg work, you ever tried these?