Some guys shy away from baby duties simply because they don't feel like they know what they are doing.
Little do guys know that having a baby is new to us too!  We don't know what to expect or what to do when the baby is screaming his head off and refuses to sleep for 18 hours straight! (oh, the memories!)   But we are the moms so we do it because that is what moms do. 

Encourage your guy to be involved for his sake, your sake and the baby's sake. 

Moms have to cooperate too.  It won't work unless you relenquish some of your parenting power.  You don't have to do it all!

I just ran acros this book by Scott Mactavish...I have not read it (my baby having days are over if all goes as planned), but I found this wonderful exerpt from his book, The New Dad's Survival Guide : Man-to-Man Advice for First-Time Fathers 

If you are pregnant I would strongly suggest looking into this witty, first-hand advice that Scot Mactavish's book has to offer.  At least print out the exerpt for your husband.  The more he knows, the more involved he feels, and the better it is for everyone. You can buy it at Amazon following the link below.
The New Dad's Survival Guide: Man-to-Man Advice for First-Time Fathers

This book looks great and seems to lay it out straight for guys.  Pregnancy, childbirth and parenting is a life-changing experience so you might as well not fight it, embrace it.  A book and other people's experiences will never have you fully prepared for your own baby, but I imagine it can get you started. 

Here are some links to dad-friendly sites: (let them know they are not alone!)

http://www.babycenter.com/dads/

http://www.greatdad.com/

http://www.drmoz.com/momdadbabyblogs.html#DadBlogs

http://www.dadgear.com/index2.cfm?CFID=4792034&CFTOKEN=93013450  (be the coolest dad on the block)