Camera+ for iPad arrived today after two years in development. Combined with a major Camera+ for iPhone update, the two now feature iCloud Lightbox Sync, allowing you to sync the photos in your lightbox between all iOS devices.
The lightbox feature of Camera+ (and others like Camera Plus Pro) is great if you want to work with a lot of photos but not clutter up your Photo Stream. By default, photos you shoot with Camera+ stay in the app’s own lightbox, and only get sent back to your Camera Roll on a per-photo basis or synced if you enable the option in settings.