The Adobe Reader 7.0.7 update adds new functionality, fixes a number of bugs, and is more secure. Adobe recommends that all Adobe Reader 7.0x users apply this update.
New features/improvements in Adobe Reader 7.0.7 Support for new 3D content: Reader 7.0.7 allows you to view, interact with, annotate, and measure 3D content embedded in PDF documents created with Adobe Acrobat 3D. Adobe Reader