Spaces, the newest app which lets users create a space with just one tap for any topic. Sharing is key as anyone can be invite via messaging, email, social network or whatever, (that's what google said). The biggest features that stand would having built in Google search, YouTube all without having to leave the app.
Google Play Music now lets users upload 50,000 songs into the cloud. In addition songs can be uploaded to your music collection via the web through the Chrome web browser. I included a short video of TWIT Netcast Network discussing the news about it.
More Reading: From The Verge published a detailed article of this story or visit Google Music for more info.
This infographic demonstrates the tips & tricks for any Google user to get the most out of their searches. (use the read more to view)
The newest feature to show up in Google+, Stories. Aims to create a dynamic scrapbook like slideshow of your photos and videos. Their live example (as shown below) is actually done very well. And stories even come with their own url + full screen capabilities.
Stories is available on:
You can see a live example of stories here. Featuring a family trip to Cabo San Lucas.
Read more about Google+ Stories & Movies from the official blog post.