I've been lazy in posting these, but here's what's been in the past few releases

• Various enhancements / tweaks to the Challenges feature
• Added a number of new challenges
• The Browse Items and Game Details pages now shows all alias names (the latter didn't show any previously)
• Added the Completion Activity report
• Added a Release Date column to the table when browsing by platform
• Added a collection checklist for Atari Lynx (NTSC-U)
• Added a collection checklist for Microsoft Xbox (NTSC-U)
• Added a collection checklist for Sega Pico (NTSC-U)