To get ze bigger picture of the salaries instead of just based on points ratio for salaries as above, this is from Il Mondo:
Milan and Inter are leading with 120 million euro, followed by Juventus (115), Roma (65), Fiorentina (37), Genoa (35), Napoli (29), Palermo (28), Lazio (27), Torino (25), Sampdoria (20), Cagliari (20), Catania (20), Bologna (19), Siena (18,5), Lecce (18), Chievo (14), Udinese (14), Atalanta (12,5) and Reggina (11,4).