Here are mine:
Kindle - Perfect for travelling and holidays, I can have lots of books with me that take up hardly any space. Also I can read books from NetGalley on it.
Goodreads - Great for book recommendations as well as being able to rate and review books etc. Also the app on my phone is very useful when in bookshops and I can't remember everything on my wishlist, can look it up quickly.
My Book Journal - As well as the main section for my thought on books it also has sections I use for my TBR/Wishlist. Can look through it quickly when deciding what to read next.
Local Library - I can suggest and reserve books for free as well as borrow them, saves me a lot of money
Amazon - I have discovered books with "customers who bought this item also bought" and also like looking through the future releases section.
eReaderIQ - A great site that emails you when kindle ebooks you've added drop in price, means you don't have to keep checking your wishlist on Amazon.
Fantastic Fiction - Can look up authors books and when they were published, very handy if I want to read a series in the correct order or see other books by an author I've just discovered.
NetGalley - Only joined earlier this year but been lucky to get review copies of some interesting books and because of this I started my blog.
Tablet - Bought this last month and it meant I could post reviews on my blog while on holiday instead of waiting until I returned home.
Memes - There are some great memes I participate in on my blog, as well as Top Ten Tuesday others I like include Book Blogger Hop, Waiting On Wednesday and Friday Finds.