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By wholder
I'd like an Arduino shield that looked like:

but provided the following features:

1. A beefier 3.3 Volt regulator and pins to tap this voltage
2. Switchable, onboard level convertors for selected pins, such as:
a. Analog input pin 4 (SDA) and analog input pin 5 (SCL)
b. Digital pins 10,11,12 & 13 (SS,MOSI,MISO & SCK)

This would make it a lot easier to prototype with 3.3 volt logic devices and still have full 16 MHz speed. Right now I use level convertors for this, but this takes up so much space on the small protoboards that I hardly have space left for the devices I'm trying to work with.