Main new features are: - New semen physics (lol). - Striped thighhigh and overknee stockings. - Secondary RGB controls for collars and footwear. - Added support for dialogue with audio using swf mods.
There are also now copy and paste buttons on RGB controls, and a several minor bug fixes and tweaks to the UI.
It's not that convenient to search for a specific one, but the master list is where you can download them all at once.
Check once a month for updates, new features, etc. There's also a booru with hair models, and just google-ing you can find forums with requests and a ton of resources.