It'll do me no good to add these sites into the software manager?
Nope.
In either case I'm curious, what is "Relative path to synthesis or hdlist"?
I suspect it means the path to the actual files on the sever, or maybe an index of the files contained on the server. i.e. the index to tell your computer *Where* to look for them. (actually, by RTFM'ing I see that they do indeed have index files that end in .cz on the servers).
So, recap:
If you want to find rpm's on the net, then use these 2 links. i.e. go to these links in your web browser, find the rpm on the web site, and download it through the web browser.
www.freshrpms.net (these may/may not work with mandrake very well) www.rpmfind.net
Secondly, there is the mandrake software manager, which can automatically download a list of mirror sites from which you can find RPM's. This is probably your best option. I haven't used Mandrake for almost a year now, I don't remember the exact buttons to press, but I'm sure a little time spent on it will help you find it. If not, there is excellent documentation on the Mandrake website, you may have missed the section on installing packages in the User Guide the 1st time round. e.g.
http://www.linux-mandrake.com/en/doc/82/en/user.html/x11454.html#AEN11465 I think all I did was to add a security update source, and that had the other rpms on it as well. Try it, it's not going to hurt!
http://www.mandrakeuser.org has lots of documentation that is worth reading.
Once you read the manual and understand it, all you need to do is find some mirrors with rpm packages on, although IIRC, the security update did that for me.
Ricardo