I have curretnly designed a shield that incorporates the following..
RTC
8 Leds
8 INpuuts
8 Relays
8 1WIre Outputs
5 Buttons
LCD Interface
ADC Interface
This board will allow anyone to learn about different interface technologies(eg spi, i2c etc) and have the ability for anyone to have shield that will cover 80% of everyones ideas into practice.
Let me know if anyone is interested in this shield, i will be taking pre-orders. The pcb is currently being finilised.
I have worked on this shield for the last year so i feel it will be useful to alot of people. My background is in electronics so i am excited to releasmy first product.