how can i create informers like
top ten posters
top forums
last 10 posts on forum .. ?
I think what you are talking about is called a portal.
Sort of like this? Ignore the doubles, I broke that one (thank god it's a test forum!).
Anyway, if that's what you mean try searching the mods for portals. I found one
here but I don't know how good (or bad) it is.