I've never displayed my email directly on the blog, due to spammers. But at the same time, it did prevent some communication. Sure, you can subscribe to my blog, but couldn't email me, unless we had met in person and you had gotten my "carte de visite" (a visiting or calling card) or my business card.
I sign my posts with my twitter id ( @f_dion ) and it is possible to contact me through it, but I do realize that sometimes it is much better to use email.
I've now added a contact form (on the right side, last widget at the bottom). You'll be able to contact me that way.