I have been participating in the Bloggers for Peer-Reviewed Research Reporting (BPR3) initiative, which attempts to highlight serious, thoughtful blog entries on peer-reviewed research (using icons). The aggregation system I mentioned before has now gone live on the great site Researchblogging.org. Basically, whenever a blog author wants to make use of the new system, they go to the Researchblogging site, enter citation meta-data into a form which then spits out code that gets included in the relevant blog entry. Then Researchblogging.org aggregates all the blog entries that contain the code, lists them on the website and categorizes them into subject-areas.
Have a look at the site, it's a fantastic way to discover more academic blogs and entries on serious research.