Sometimes you need some useful examples and schematics for reference, circuit design and projects. You can found it from books but this is not enough. Here is some useful links that provide various types of schematics.
formatting link- CXI Schematics
formatting link- DiscoverCircuits free electronic circuit
formatting link- Aaron's Homepage
formatting link- Bowden'sHobbyCircuits
Sometimes you saw some electronics kits distributors online such as Quasar Electronics and Kitsrus.com, they also provide the circuit schematic, simply download their kits data sheet and refer their schematic. Most of the schematic is the complete circuits, except the programmer.
formatting link- Quasar Electronics kits
formatting link- Kitsrus.com
formatting link- Electronics 123