Similar pages will simply hit supplemental results. If these pages are to close it will show the most dominant ranked listing since it can't determine the differences between the pages. Otherwise it's a standard suppl result and needs to more backlinks with proper anchor text.
Two weeks ago google hit a sandbox on some sites, and they started to lose ranking. About a week ago they did some algo change which shifted some rankings but overall didn't seem to change much. And as of late last night some big happened or a relist is taking place.
Either way, I'm waiting a few more days before I start looking for problems.
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