Not sure this is exactly what you're after, but I use
GoogleAlert.
Use it to monitor the top slots on a range of searches.
Not as useful as it was before my sites fall from (google's) grace only to be replaced by link pools and ad-word carrying portals (boo! hisss!).
(I don't even come in top for New Plastic Arts anymore, despite having the domain, the title and the h1 tag. Stuck behind two forum links back to me, one of the DT, the other SPf. Fekkin G eejits. S'all gone to sh*t.)