As just mentioned in another posting, PubMed can now display links to related articles, alongside the abstract that you are reading. You used to have to click a link to display related articles. You can turn this feature off and have it looking exactly as it did before.
PubMed has a New/Noteworthy feature, at http://www.ncbi.nlm.nih.gov/feed/rss.cgi?ChanKey=PubMedNewsm, which mentions this, and which is also available as an RSS feed. You can also receive updates to PubMed searches via RSS: if you want to see what this might be like, you can see an example in our avian and pandemic flu pages. RSS is an interesting way to keep up to date, as you can get information delivered to you and then look at it when it suits you. I am trying it via Bloglines. If this intrigues you, please contact me to find out more.