I have watch this webpage:
http://www.simutrans-tips.com
More tip's link are old (not present). It's the moment to upgrade this?
Well, some of them are still usefull, but wouldn't be a bad idea to contact with the author in order to carry out a big upgrade.
Last update is only 3 months old, so it isn't really dead... yet ;D At a (very short) glance the basics are covered reasonably, and the game itself didn't get a total overhaul, so it isn't harmful.
But yes, old pages are problem, always.