I finally set up a mirror for Slackware 14.1 and -current (both i686 and x86_64) as well as multilib for 14.1. Here are the links:
Mirrors are updated every 2 hours. Be warned, however, that FTP access is VERY limited: only 4 clients at a time with no more than 2 connections per IP.
I may add other not too big repos in the future.