I needed an Atmega328 board with wireless capabilities for a recent project so I decided to put one together. This board uses an SMD version of the Atmega328p-pu which is called the Atmega328au. The au version is in a 32 pin tqfp package which is fairly easy for the hobbyist to handle. It has a JST-PH connector for powering with a li-po battery, a 3.3 volt low dropout regulator to power the radio, and runs at 16MHz. Standard spacing holes allow it to be plugged into a breadboard if pins are soldered to it. For my project I needed a voltage divider connected to each of the ADC pins so there are spots for 8 smd 0805 resistors that have one side grounded.
For wireless capabilities I use the inexpensive NRF24L01+ modules frequently seen on EBAY. A female header allows the module to be plugged and unplugged so that the board can be programmed through the same connector. This saved a bit of space by eliminating the need for a separate ISP connector.