There are many "Top 10 lists" appearing, since of course the year is coming to an end. Many of these lists on the Christian blogosphere are "Top 10 Christian Books of the Year" lists. I note a few here in annotated/digest form that may be helpful.
Jesus Creed (Scot McKnight) provides a varied list, including, science and faith, theology, reference, etc.
Phil Long over on Reading Acts includes his "opinions" of the best biblical studies books of the year, including, OT, Second Temple, and a few divisions of the NT. He says that these are also "books I have personally read and found useful" (I like that approach - its just too easy to suggest a book).
Unsettled Christianity: Joel Watts assembles an interesting list that will probably not reach as broad an audience as the other lists, but is worth a look. Mostly NT oriented with a smattering of historical and some hermeneutical studies.
Christianity Today: Many books listed here from many categories; theology to fiction, mission to culture. I was happy to see my former professor C. John "Jack" Collins was honored for his Did Adam and Eve Really Exist?: Who They Were and Why You Should Care (Crossway). And J. Todd Billings was also honored for the much needed scholarship on union with Christ in his book Union with Christ: Reframing Theology and Ministry for the Church.
The Gospel Coalition: TGC staff weighs in and picks up to three books of 2012 each. One of note is J.P. Moreland's 15th anniversary edition of Love Your God With All of Your Mind. This was a very impactful book in my journey, and I am glad to hear that it has been revisited by Moreland and that IVP republished this work for a new generation.