well, not sure if this helps, but what i found is that comparing your shots to many many other people's.. i.e. if you happen to be on a very common scene, e.g. national stadium.. do a search on flickr.
this does not mean that you have to reproduce other people's viewpoints.. just learn from what they are doing. ask yourself why their shots seem more interesting than yours. and be honest, just because a photo on flickr has many good positive comments does not mean it is a good shot. some of the people on flickr just have a lot of contacts/buddies that pump each other ego and shoot each other to explore, i'm sure you've seen it before. i guess that might help.