What I like about my subscription of the German weekly newspaper 'Die Zeit' is that they allow sending the mobi directly to your Send-To-Kindle-email address.
Love that feature! Every wednesday, I get it automatically pushed to my kindle and it's fabulous! The only annoying part: it's not really optimised for a small screen and graphics are often left out, but hey, it's still great!
Are you aware of other magazines offering that?