somebody tell me how to obtain them please, I keep getting a 403 for that rss.s2ch.net thing

It's gone. You are better off using 2ch browsers.

But it's a pain when I want to keep track of 2ch threads from various computers. I use Google Reader to keep track of stuff and check them from anywhere... guess I'll have to keep to 2ch threads only at home then. What a royal pain in the ass. :/

USB drives are really cheap these days.

You could write something which scrapes the site and creates an RSS feed.

If they complain about you hitting the site too much then you could say "just get a fucking RSS feed already, even a one-page web site has one these days" and then install the scraper on 1000 other computers and start hammering that shit.