The BMW E39 is the BMW 5 Series made between 1995 and 2003. The E39 was the successor of the BMW E34 in 1995, and itself was replaced by the E60 platform in 2003.
http://en.wikipedia.org/wiki/BMW_E39

Forums like the E38 7-series, the E32 7-series, the E23 7-series, the E39 5-series, the E34 5-series, and the E28 5-series are among the most informative and active on the internet.
http://e39.org/

The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw ...
http://www.bimmerfest.com/forums/forumdisplay.php?f=103

BMW E39 DIY (Do It Yourself). For the home mechanic!
http://www.bimmerdiy.com/dir/e39

The BMW E39 M5 is still the best performance sedan EVER made. Click to learn about this incredible car. Videos, specs, year-by-year reviews and listings.
http://www.m5e39.com/