Yes, this HowTo looks not that easy...
However, I recently found  this: http://www.sparkleshare.org/
It's basically similar to dropbox, but allows you to use your own server. I think I'll give it a try at some point.

Hey!

I thought about running an iFolder (http://www.ifolder.com/ifolder) server on my plug to easily sync my files. Do you think it's possible at all? I'd like to try it next week, because I have no access to my plug right now.

Thanks for your answers.
Yes, something like tonido would be great, but I prefer a something free/open source!

Hey!

I wonder if there's some kind of a free, good looking http frontend to access my files (e.g. pictures, music,...). Basically I backup all my files (documents as well as media files) on the plug and I want something that offers me the ability to access them over the web (a optimised view for my mobile browser would be nice too) in a comfortable manner. It should be something like the frontends of all these online storage services like humyo or dropbox, so something with a nice image gallery, maybe the ability to stream a music file, etc. . Maybe you know something like this?!