What Bluetooth 4.0 devices and radios are available?
Consumer Devices
Android

Samsung phones[specify]
HTC phones[specify]

Android 4.3 (API level 18) comes with an official Bluetooth Low Energy API.  In older versions, BLE was not integrated into the Android API so each manufacturer had/has their own API.
Apple
iOS

iPhone 4S, 5+
iPad 3g, 4g, mini
iPod Touch 5g, Nano 7g

OS X

MacBook Air (Mid 2011/Model 4,x+)
Mac Mini (Mid 2011/Model 5,x+)


Modules
BlueGiga

BLE112 - single mode, programmable micro (8051) with spare GPIO/ADC
BLE113 - like 112 but with USB interface and additional BlueGiga stack software(?)
BT111 - dual mode (LE/classic), programmable micro

RedBear

BLE Shield/BLE Mini - hobbyist-level modules, may lack FCC cert.

Laird Technologies

BL600 Series
BL620 Series

muRata Technologies

There are three modules: Type VZ, Type WS, Type 1BX

connectBlue

OLP425

Roving Networks, acquired by Microchip

RN4020
RN4677


ICs
TI

CC2541 BLE SoC
CC2560 Bluetooth 4.0 dual mode supported
lots.

Nordic Semi

nRF51822
nRF80001
nRF80002