Standard feeds:

• Latest Posts - latest posts (all posts)
• New Questions - latest questions
• New Job postings - latest jobs

Advanced usage, multiple sources can be added to a feed.

• Follow posts of different types, posts of certain types: /feeds/type/job+blog
• Follow multiple posts, answers and comments attached to the specified posts: /feeds/post/2+8+10
• Follow multiple tags, posts that are tagged with one or more tags: /feeds/tag/galaxy+bwa+tutorial
• Follow multiple users a feed to posts by these users: /feeds/user/2+8+10