In my case, it looks something like this.
This is a “working pile” as I scan my books into Delicious Library and add cover art and other details: about 1200 volumes, all told. Of course, that does not include library books, magazines, or the few books I still have left in New Zealand, but it is a good approximation. (Design, technology and programming books are not in this pile: they are back at my office.)
Delicious Library is working very well as a cataloging system; I only wish its search routines were a little more precise (finding the particular year of publication for a volume can be difficult when it has print runs over decades, and locating cover art not supplied by Amazon is a Google image search for the book’s title, rather than title + author.)