To keep you busy:
www.monergism.com
A huge library full of resources on pretty much any topic, from current and classic authors. Also some classic Christian books and sermons on MP3.
www.desiringgod.org
God-centered resources from the ministries of John Piper.
www.puritansermons.com
God-centered resources from the English puritans of the 16th and 17th centuries. Includes books, sermons, and poetry.
www.theologica.blogspot.com
Between Two Worlds: A blog with a mix of theology, philosophy, politics, and culture. One of the most popular Christian blogs.
www.discerningreader.com
Book reviews and recommendations.
www.marshillchurch.org
From the ministries of Mark Driscoll - a fiery young preacher and senior pastor of a megachurch in Seattle.
Watch later in the summer for more!