Check out The Good Old Days.
http://www.goodolddays.net/
And their PC section:
http://www.goodolddays.net/list/system%2C4/
They have a forum too.
But I also recommend, as someone already said, TDC the Total DOS Collection keep exact filenames and sizes and dates for files that were released as dos floppies.
http://www.totaldoscollection.org/