I enjoy reading comic books but cannot keep up with all the stories or even catch up with past storylines, etc., partially because I can't afford it and partially because there is a lot of comic history and I am a relatively new comic reader. But I do like to read some as I am able. My problem is that for some stories it is nice to know what is happening in other titles or in the universe in general or to know past events.
My questions is: Is there any outline of main events/important happenings of either past or current events or both? I'd love to be able to have some reference material so I can read the stories in context.