Here are some of the best Oscar monitoring sites on the web:
Matt Awards
The Film Experience
Film Misery
Awards Frenzy
Cinema Sight
NewFoundFilm
Scott Feinberg.com
Awards Circuit
Variety Awards Central
Awards Tracker
And especially...Awards Daily
and In Contention
Here are the sites to find all past nominees and winners of Oscars and other relevant awards:
Academy Awards
Golden Globe Awards
British Academy Film and Television Awards (BAFTA)
Broadcast Film Critics Association Awards (BFCA)
Producers Guild of America Awards (PGA)
Directors Guild of America Awards (DGA)
Screen Actors Guild of America Awards (SAG)
Writers Guild of America Awards (WGA)
Art Directors Guild Awards (ADG)
American Society of Cinematographers Awards (ASC)
American Cinema Editors Awards (ACE)
Costume Designers Guild Awards (CDG)
Visual Effects Society Awards (VES)
Cinema Audio Society Awards (CAS)
Motion Picture Sound Editors Awards(MPSE)
International Film Music Critics Awards (IFMCA)
Annie Awards
Here are a couple of other sites that could be useful for Oscar watchers:
Rotten Tomatoes (for average movie review scores)
Box Office Mojo (for box office stats)
Quicktime Movie Trailers (for the latest trailers)