I also interfaced the top of the raglan sleeves. I couldn't really find any info on raglan sleeves in jackets so I don't know what the "right" thing to do is, but I figure it couldn't hurt to give them a little more oomph too. (I hope I don't come to regret this!)
I used pro-tricot fusible interfacing from Sew Exciting.
Good mail! This week's New Yorker is "The Style Issue"; it includes an article on Donatella Versace which will surely entertain. And so that I could qualify for free shipping, I added Couture Sewing Techniques to a recent Amazon order. No more schlepping to the library for this one.