I think it would be great if the site would present counts (total number, and number of unique cards) when filtering. That information already shows up for the entire inventory, but I often want to know how many cards I have in a specific block or edition.

As an example, if I search MTG cards and filter for only cards in the Dark Ascension set, I currently get the appropriate number of pages of results, but I have no way to see how many cards in total I have in that block, or how many uniques I have in that block.