.Net Magazine is one the best web development magazines I’ve come across. Published in the UK by Future Publishing, the magazine is full of tips and techniques on coding, SEO, UI Design, best practices, and more! Each issue also includes a DVD with real life exercises to enhance development and design skills. You can’t go wrong with this magazine.
I highly recommend getting a yearly subscription as the individual cost of each magazine is pretty pricy ($15.99 US).
As of this writing, they are working on redoing their website to make it a central place for web design resources and development articles. I recommend registering for a free account even if you don’t have a subscription. There are a lot of valuable articles and tutorials available!