The Arduino WiFi BlackWidow is a Duemilanove compatible clone that has wireless connectivity baked directly onto the board, eliminating the need for a WiFi shield.
Get Your Wireless Internet Connection with the Arduino WiFi BlackWidow!

The BlackWidow, or as some would call it, the "WiFi Arduino", will give your Arduino projects added wireless connectivity without the need for additional bulky shields.
The components have been replaced with surface mount equivalents to make room for the on-board 802.11b WiFi module.
Features:
- Same form-factor as the Duemilanove
- Up to 14 digital I/O pins
- 6 analog input pins
- Atmel ATmega328P microcontroller (32KB flash RAM, 2KB SRAM, 1KB EEPROM)
- USB 5-pin mini-B connector
- Auto-switchable power between USB and external DC power
- 2-pin JST connector allows for different types of external power options (JST to DC barrel jack, Lithium-ion battery pack, etc.)
- 802.11b 1 and 2 Mbps connectivity
- On-board PCB antenna
- Supports infrastructure mode (BSS) and adhoc (IBSS) network modes
- Ability to connect to secured wireless networks; WEP (64-bit and 128-bit), WPA/WPA2 (TKIP and AES) PSK
The Arduino WiFi BlackWidow is fully compatible with the Processing/Wiring IDE, and is best suited for low data rate applications, such as simple control and sensor applications like temperature readings. You can buy yours here.
