In my mailbox is a weekly meme hosted by http://www.thestorysiren.com/. This is the description from the site of how it works:
"1. Every week we'll post about what books we have received that week (via your mailbox/library/store bought)! Preferably posts will be made every Sunday, but feel free to choose a day that works best for you.
2. Everyone that agrees to participate will try to visit each other's list and leave comments!
3. Everyone is welcome to join! You can join at anytime and you DO NOT have to participate every week.
4. Be sure to sign the Mr. Linky Widget (that will be posted each Sunday with my In My Mailbox post) so that others can easily find your "In My Mailbox" post! You DO NOT have to title your post "In My Mailbox"
5. Link back here, to The Story Siren, on your In My Mailbox post, so that other people can find more information about IMM.
Try to have fun!"