Do you know some good magazines dedicated to landscape photography?
I already know Outdoor Photographer and Outdoor Photography magazines but check for new ones.
I second the Lenswork recommendation. Most issues have at least one portfolio that might be called landscape work, including artists like Alan Ross, John Sexton etc. in recent years.
I really like View Camera magazine, which probably has a good landscape portfolio about every other issue. It typically includes some discussion of æsthetic/artistic questions as well as technique. Some of the color landscape work highlighted has been beautiful.
Henry Rasmussen's Black & White
magazine is another decent source; the quality of the portfolios varies all over the map from beautiful to what were they thinking?,
but some are very worthwhile.