I use Google Reader to keep up on the literature from a wide variety of academic journals. Many of the official feeds for these journals are hopelessly cluttered with unnecessary information -- book reviews, news pieces, polls, and even ads. While some of these can be interesting, I like to keep my journal feeds uncluttered and limited to actual papers. For this reason, I've created some automatically-filtered copies of several of the worst-offenders*:

1. Science  
2. Nature
3. Nature Climate Change
4. Nature Geoscience
5. PNAS (filtered to exclude bio/chem to the best extent possible)

*No offense to these publishers intended -- I do enjoy most of the articles I'm filtering out. I just don't like the clutter when I'm reading papers.