... between the file size of the document and the list of options (Cached, Similar pages, Note this):

http://img223.imageshack.us/img223/4294/serplinebreaksu0.png

Looks weird with the last slash after the file size, as that seems redundant now. Wonder what motivated Google to do this change (accomodating for larger screen resolutions?). It seems to potentially decrease the recognizability of "that blue line starting at the left side is the result title link".

See also: http://www.seroundtable.com/archives/015923.html

I'd remove the link to "Similar pages" and replace "Note this" with a star (like in Gmail, Google Reader etc.) so you can bookmark web pages.

It probably was just an experiment or maybe a mistake.