The AT89C2051/ATtiny2313 evaluation board is suited well for building and testing microcontroller circuits. You can either use an AT89C2051 or an ATtiny2313, both microcontrollers are almost pincompatible, just the reset pin has different polarity. The ATtiny2313 has the advantage that it can be programmed in-circuit via SPI. Furthermore it supports On-Chip-Debugging via the built-in DebugWire interface. Debugging can be done via the reset pin with the "JTAGICE mkII" from Atmel.