I use LaTeX since 2001, and I am particularly interested in bibliographies. As I am a historian and as such face weird style sheets from time to time, I was very happy when biblatex came out in 2006 and I immediately began to use it for most of my documents. By now I have provided one biblatex style matching the requirements of the German historical journal “Historische Zeitschrift” (which I called – ever so creatively – historische-zeitschrift) and one package (biblatex-dw) with two biblatex styles (authortitle-dw and footnote-dw). With the latter styles I try to ease the use and tweaking of biblatex for “normal” users.
Apart from that, I also made a German adaption of the bibleref package called bibleref-german.