It really depends on the tour company. Most will take a look at your blog to try to determine if you are a match for any of their tours. A feature usually means featuring the author and book.
I am currently looking for tour hosts. I cover many different genres of books but am currently booking a tour for readers who like YA (young adult) books. Your welcome to send me an email for this or to get in my database for future tours.
A book feature normally summarizes the book. Here is a sample from my blog:
A tour might also want you to interview the author, host a giveaway, and/or review the book.
Very very thrilled to welcome L.J. Sellers. She is touring for her latest bookThe Arranger on the virtual space and since I have read the book i'd say she has done a great job - a clever manipulation of the scenarios in the book. I would definitely suggest you people to try it. Well without a further wait....I present before you all the good stuffs.....read on and be surprised.
Check out the book - its summary - its review
AN EXCLUSIVE INTERVIEW OF THE AUTHOR
AN EBOOK GIVEAWAY (Ends 21st Sept, 2011)
7 more host/blogger needed who can host a middle grade fiction