Don't know if this helps...
Top Left:
A symbol that resembles Phillips
HC574
BE76439
UuG648G
Top Middle:
A030
T2313A
MUDB
OF2670
Top Right:
SILABS
CP2102
DCLOCW
1311+
Bottom Right:
Z1021A1
ZAOP11
Here's my identification of the parts. The layout seems to match this identification. I've also included a per-unit price estimation, based on 10,000 unit quantities at digikey.
Top left: NXP Semiconductor 74HC574 (octal D-type flip-flop), about 0.12 USD
Top middle: Atmel ATTiny2313 (8 bit microcontroller), about 0.72 USD
Top right: Silicon Laboratories CP2102 (USB to UART interface), about 2.30 USD
Bottom right: Alpha & Omega Semiconductor AOZ1021 (3A synchronous buck regulator), about 0.50 USD