I just added network support in PSP-Python. After one function call to actually connect, all the network-related classes/modules of the standard library work as is. Documentation and download on the Wiki:
http://fraca7.free.fr/pspwiki/doku.php
Two samples are included, a simple echo server and an HTTP server that just shows the contents of the memory stick (and allows to download the files that are there).
Have fun.
[Announce] PSP-Python with network support
Update - bug fix
Argh. This version introduced a serious bug preventing script.py from importing anything that wasn't under ms0:/python; this is fixed now.