Heh, is this a "who knows the most underground bands" thread ?
Anyway, favourite albums of 2005 so far for me:
Donnas - Gold Medal
Beck - Guero
Coldplay - X&Y
Matthew Good - In a Coma
Depeche Mode - Playing the Angel (John the Revelator is excellent)
Beck album is really really damn good, and oddly enough the Guerolito remix followup really wakes up some of the weaker songs on the original album.
Donnas album is probably one of the best riff rock albums I've heard in a long time. Dumb lyrics, but really really catchy and crunchy riffs. One of the best rock albums in '05 imo.