Well, you can just go to amazon and look up Samba collections.
Link to a great resource for all music for all forms of Ballroom, Latin and Nightclub dances...
http://www.dance-forums.com/music/genre/samba/
But.. here are some songs, current and traditional that are great Sambas...
Mas Que Nada by Sergio Mendes is great
Soul Bossa Nova - Quincy Jones & his Orchestra
Bailamos - Enrique Iglesias
Eso Beso - Paul Anka
Cha Cha - Chelo (don't let the name fool you, it's a fun samba to dance)
Sir Duke - Stevie Wonder
Heaven Must be Missing and Angel - Tavares
Love is in the Air - John Paul Young
Brazil - Johnny Mathis
The forum is a great resource and like I said, just check Amazon's Samba collections, especially the one's that let you listen first.