Here are Ten Reasons to Try Flash Fiction. It’s only a short article which uses common sense to explain what you should and shouldn’t do in this “genre” (I believe it’s been given this status now).
On Flash Writing is another article that I found interesting. After reading it I decided that I’m an “editor writer” and I think that accounts for the pace problem in my first piece of flash fiction. Have you tried writing at top speed? It’s hard, but I suppose we can train ourselves to do it.