We love CB2s Axis storage unit shown in their new Fall catalog. The mix and match style allows you to create a wraparound bookcase or an independent side table at any length you prefer. We personally prefer the look of the wraparound style. The clean lines compliment almost any couch.
The Linteloo Circular Bookcase is fresh and interesting and would fit well in a corner of a room. Jonathan recently posted about this uniquely designed bookcase here.
One of Apartment Therapy's favorites - Ikea's Expedit Bookcase. We love seeing this piece as a room divider or floating near another piece of furniture, similar to the Axis storage unit. For More Design Flow Ideas: