Don't forget, your eurail pass will cover your fare on the S-bahn in Germany. I didn't know this and ran into the same trouble this article talks about. There is a handy list of what you pass covers in Germany at the end too.
http://noambit.typepad.com/my_weblog...gh-it-was.html

whoops forgot my question. does anybody know if the eurail covers your travel up the Jung Frau in Switzerland?

Eurail gives 25% off the Jungfrau train from Interlaken-Ost where the pass validity ends - with the 25% you need not use a day of travel on a flexipass however.

The Eurail/S Bahn confusion i read about on your link could come from some confusing language i have read vis a vis railpasses valid in Germany (Eurail, Germany, German-other country passes) is that it's good on all S-Bahns except those in Berlin that are not going between mainline railway stations

(Zoo to the new central station for example)

But in Berlin last January i asked a few times at train info counters and they told me it was good on all S-Bahns - i'm still not sure technically it is.

And since sometimes U Bahns and S Bahns run over the same trains be careful which train you are boarding if using a pass.

All trains operated by DB will show the DB logo. Just have a look at the train (S-Bahn), before you board.

Not everywhere the S-Bahnen are run by DB, so check. Those in Karlsruhe, for example, are not.

cmc05ad is simply advertising his/her website contrary to the forum rules.