Samotnaf was asking about how to post pdfs. As far as I remember the way is to post a library article which is a description / introduction to the pdf and then attach the pdf as a file.
I did a quick site search to check if I was right and noticed that a lot of the pdfs didn't seem to be attached any more. I was wondering if this might be due to changing paths making links stop working or whether there was more to it.
These are some ones where the pdf is missing or there is no link to it.
http://libcom.org/library/institution-building-soviet-russia-thomas-remington
http://libcom.org/library/reading-capital-politically-cleaver-bibliography
http://libcom.org/library/theory-bloom
Some are still working eg:
http://libcom.org/library/aufheben/aufheben-14-2006/intakes-inside-outside-the-g8-protests
I opened up the Remington pdf with the edit function and the link is still there but the format might not be right any more. At first I thought it was older files that weren't working but the tiqqun one is fairly new so I think it is the links that need checking/fixing.
Sorry for giving you extra work Mike 
Can comment on articles and discussions
To upload a pdf to library;
click on 'submit content' near top of page, then on 'library' -
on 'Create library' page click on 'file attachments' near bottom of page -
click on 'browse' to find pdf file on your PC -
'file upload' box should open on your screen -
select file and then click 'open' -
file should appear in 'attach new file box' -
then click 'attach' and wait for file to attach -
when file is attached, click 'list'.
Fill in 'intro' & (if you have a long intro) 'body' text box, 'image', 'tags' as normal - press 'preview' to check layout, then 'save' to make permanent library page.