One of the things that I, and many others, love about our hobby is the sharing of ideas that takes place amongst builders. One such example that I came across the other day is the LEGO Train Ideas pool
on Flickr. This group is just getting started, so submissions are few at the moment, but even now it's a great resource for builders who are wondering how a certain look or piece of engineering may have been accomplished. Resources like this, and the builders who are willing to share their techniques openly are what help our hobby move forward. I'm really looking forward to keeping an eye on this pool to see what comes next.