Well, there's not one site with lots of article, but usually google + player name should give you something. 11 Freunde has many articles/interviews with former players, there are many football/fan blogs with sometimes great articles. If you don't find something directly about the player, then start looking into the teams he played for.
In general the Bundesliga is less covered than the other big leagues, which sadly sucks.
A good indicator is how few quality compilations of players you can find on youtube. I've been looking for good videos about Häßler for example, but there's nothing, zilch. Same with Dunga despite his sensational form at Stuttgart. You find videos about their exploits with the nationalteam, but in the league? Nope. You'll get whole games with them playing, but no one has bothered to cut them into highlight videos that people would actually watch
.
So yeah, it's a bigger challenge. Maybe we really should do a Bundesliga draft in the near future and build on what we've done now. If people are interested of course, because it might be a bit more work for the managers.