New
Point your camera, not your keyboard. Adding a book, comic, vinyl record, or board game used to mean typing out its ISBN or barcode by hand, digit by digit, if you bothered at all. Line the barcode up in your camera when adding one of these now, and its details fill themselves in.
A category for your bricks. Lego sets get their own category, with fields for the set number, theme, piece count, number of minifigures, release date, and minimum age.
Changed
A proper front door. The home page used to be a single static article. It's a real landing page now, with an overview of what Collectiary does, its categories, pricing, and recent posts from this blog. Signed in already? You're taken straight to your own items instead.