Video Standards have gone crazy

Today someone asked me for help on setting up their monitor.  I discovered to my dismay that there are now way too many video resolution standards.  This chart is from: http://en.wikipedia.org/wiki/File:Vector_Video_Standards2.svg

Now try to navigate your way through that mass?  The monitor in question was WSXGA+ compatible, but actually it was1440 by 900.  And here I thought they were all supposed to be HD 1080 or 1920 by 1080.