Taking a cue from Sojourners, the 10 books closest at hand/reached for most often. Unfortunately the bookshelf that is described in the link has been on my want list for months. I still have to move to access most of my books. :(
Top 10 (in order from closest to farthest):
1) Chicago Manual of Style -- gotta have it real close for thesis writing. You get the common style points memorized quickly, but there's always those exceptions . . .
2) Lutheran Book of Worship and 3) With One Voice -- For choosing hymns.
4) Just Love -- Just happens to be the one of the many thesis sources on my desk right now.
5) Love Does No Harm 6) Promise of Lutheran Ethics 7) Premarital Sex in America -- These are not on my desk, but are the ones I reach for the most for citations.
8) The New Oxford Annotated Bible -- For getting my scripture on.
9) Love and Justice -- A great collection of shorter writings regardless of topic.
10) Doesn't technically fit as a "book on my desk," but I rely heavily on the internet for stuff like dictionaries, Constitution, free books through my Kindle (such as Luther), this site because I need to be able to spell Schüssler correctly, and probably the most used to go in conjunction with #2 and #3, Revised Common Lectionary.