Jeffrey, it would be nice if Delta's website would allow you to do a search for e.g. New York - London. At the moment all you get is 'route not valid' and you have to build your own via ATL or CVG. That sounds easy, but you have to remember the arrival times and remember the valid connection times at each airport and so on.... Moreover, the old site made you specify a particular city airport so you couldn't search for 'New York' or 'Washington'. I haven't had the heart to try the new site yet.
Catman's suggesiton is very good; do you still get bonus SkyMiles for the OAG guide? However, I too think this is a big, backward step on Delta's part. Those clunky old timetables with all the connections were too big 98% of the time, but the other 2% are the times when you really need the information, often in a hurry.
Fill in a complaint card each time you fly - it may not work, but it's the least we can do. If we don't tell them, they can't rectify it.