Thank you for your great Feedback
Site is still under impression but over the christmas holidays I want to finish it *gg*.
I have written my own snippet at the download snippet. But it is a little bit buggy, for example: Managementsummarys are not allowed to download as a "common user", but other files e.g. mediafiles, pictures should be public -> doesn’t work. So I have modified filelister and it works now at the local server.
I have used the Gallery Snippet at Fotos and have modified it with JQuery. This is still buggy too, I want to display all pictures of my albums as a overview, but I can’t find any way to realize this (after some hours search at google, modx forums, ...).
Best regards and nice holidays ;-)