I dont know of any regular magazines. There are occasional articles in video mags.
But heres some online stuff you can review:
Not a magazine, but this site, the PrPro-Wiki, will offer you a great wealth of both FAQ articles and also tutorials on how things are done in PrPro. Bookmark this site and use it as a resource.
Oops, skimmed right past Curt's link to the PrPro-Wiki. Note to self: read each previous link more closely!
Good luck, and good reading,