I was hunting for things that might help out with our planned rogue trader games, and I found that a great deal of source material is on a website called unearthed apocypha unfortunatly it seems that these highly praised articals and the website that hosts them is gone. Does anyone outthere have an alternative site where i could download these things.

You could try checking the Wayback machine at archive.org to see if it got a copy of the material. Unfortunately the material of that site was mostly in pdf format from what I recall so the site would not have those files directly.

However as luck would have it, some of the material from that site has ended up on Dark Reign.

For example, here is the Commisar document: http://www.darkreign40k.com/downloads/career-paths/commissar-career-path/details.html

Try checking the other material they have at Dark Reign to see if they have what you are looking for, it is a really great site.

What kind of stuff what is? Old WD articles or something?