Most recent hard disks do include S.M.A.R.T. support. You might find interesting to read the "What is S.M.A.R.T. and how can we use it to avoid data disaster?" article. S.M.A.R.T. can even report the temperature for your hard disk. If your disk controller, and its related drivers, allow it, SpeedFan can almost always access and report reliability data from any hard disk manufactured since 1995.
SpeedFan properly accesses the temperature sensor available in the following hard disks:

Manufacturers EXCELSTOR    15 FUJITSU    107 HITACHI    149 HP Compaq    2 IBM    53 MAXTOR    157 MDT    12 SAMSUNG    115 SEAGATE    249 SILICON IMAGE    1 TOSHIBA    53 WESTERN DIGITAL    825

Hard disks from EXCELSTOR that include a temperature sensor Manufacturer Model Size Notes EXCELSTOR EXCELSTOR TECHNOLOGY J240 40.2GB EXCELSTOR EXCELSTOR TECHNOLOGY J340 41.2GB EXCELSTOR EXCELSTOR TECHNOLOGY J360 61.5GB EXCELSTOR EXCELSTOR TECHNOLOGY J640 41.2GB EXCELSTOR EXCELSTOR TECHNOLOGY J660 58.6GB EXCELSTOR EXCELSTOR TECHNOLOGY J680 82.3GB EXCELSTOR EXCELSTOR TECHNOLOGY J680S 82.3GB EXCELSTOR EXCELSTOR TECHNOLOGY J8080 82.3GB EXCELSTOR EXCELSTOR TECHNOLOGY J8080S 82.3GB EXCELSTOR EXCELSTOR TECHNOLOGY J8160 165GB EXCELSTOR EXCELSTOR TECHNOLOGY J8160S 165GB EXCELSTOR EXCELSTOR TECHNOLOGY J840 41.2GB EXCELSTOR EXCELSTOR TECHNOLOGY J860 61.5GB EXCELSTOR EXCELSTOR TECHNOLOGY J880 82.3GB EXCELSTOR EXCELSTOR TECHNOLOGY J880S 82.3GB There are 15 HARD DISKs listed here.