There are several sites on the internet that offer articles, chat rooms, country information, book recommendations, etc. to the expatriate community. Here are some of them (in alphabetical order), including a few that are specific to Germany:

Country Reports - Germany (http://www.countryreports.org/germany.htm)
Escape Artist (http://www.escapeartist.com/expatriate/resources.htm)
Expat Exchange (http://www.expatexchange.com/index.cfm)
Expat Focus (http://www.expatfocus.com)
Expat Forum (http://www.expatforum.com)
Expatica (http://www.expatica.com)
The German Way (http://www.german-way.com/german)
The Hamburg Expat American Meetup Group (http://american.meetup.com/18/)
How to Germany (http://www.howtogermany.com)
U.S. Expatriate Handbook (http://www.us-expatriate-handbook.com/contents.htm)
Welcome2Europe (http://www.welcome-2-europe.com)

Here is also an informative website page that gives information about typical compensation packages for expats: http://www.hr-esource.com/index.asp?rightframe=hresources/sampleChapters/ihrgsampleChapter_3.html