The Forrester's marketing blog that I have just discovered is a great place to glean tidbits on the latest in Internet marketing. The folks at Forrester have long been a reliable source of marketing data and numbers, and their blog is a great place for "free" stuff. They have categories such as brand marketing, B2B marketing, mobile marketing, word-of-mouth marketing, and of course, Internet marketing.
From examining the blog, my take is that it is very heavy on Internet marketing - but this is a topic near and dear to the hearts of ALL marketers these days. Without a solid Internet marketing strategy, your marketing plan is missing a very key component!
I definitely recommend this blog as a useful resource for all marketers.