Here are some links you might enjoy:
Literary
DailyLit.com
New York Times Bestseller List
Hachette Book Group – Contests
LibraryThing.com
GoodReads.com
BookMooch.com
Shelfari.com
GNooks.com
WhatShouldIReadNext.com
BookCrossing.com
PaperbackSwap.com
BookSprouts.com
22books.com
BookCoverArchive.com
LeapTag.com
BookSeer.com
PublicLibraries.com
Charity
TheLiterarySite.com
FreeRice.com
RoomToRead.org
FirstBook.org
ReadingToKids.org
For the Kids
ChildrensBooks.About.com
JKRowling.com
Scholastic.com
PBSKids.org/ReadRainbow
SpellCity.com
PBS/Between the Lions
PBS/Word Girl
Sesame Street
InternetPublicLibrary/Kids
StarFall.com
