This page lists many of the strength feats often performed by professional old-time Strongmen, and demonstrates/explains exactly how to train for each one. Even if your goals do not include spending a bit of time in front of an audience, these are well worth learning.
After all, you can never be too strong.
Incidentally, if you’d like to discuss any of the stuff above, come and join us on the Straight to the Bar Community over on Google+. Absolutely free.