Upload image to raspberry pi over network

<code>
PC_with_SDHC_reader # nc -l -p 4444 >/dev/sdb
server_with_image # dd if=/srv/2013-09-25-wheezy-raspbian.img | nc 10.0.0.113 4444
</code>

Assumption:
   * PC's IP is 10.0.0.113
   * The SDHC card is attached to the PC as /dev/sdb
   * you have TCP/IP swiss army knife installed
That's all! 8-)