I always like it when one of my team finds out the latest information on Google first, this time I was beat to putting the blog post up but I thought I would reiterate the statement anyway.
The blog post at Just Search can be found at: http://www.justsearching.co.uk/JustBlog/google-indents-two-results-in-search-results.html
So far I’ve only seen this effect when actually looking at a specific website it dosn’t seem to happen when you change to view 100 results. It seems to be working for the most popular pages on the site. Not sure whether it’s viewing this on link popularity or actually anouther factor such as traffic or on search volume associated with a particular page.
Neil Walker is the founder of SEO at Just Search Ltd who rank on the 1st page of Google UK for "SEO". He has over 7 years experience and dealt with over 2500 clients SEO over the years. He has only started to proactively blog in the past 4 months by running "SEO Mad" - He hopes you find it interesting. 
