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    17 FUJITSU    122 HITACHI    189 HP Compaq    3 IBM    53 MAXTOR    163 MDT    14 SAMSUNG    135 SEAGATE    297 SILICON IMAGE    1 TOSHIBA    67 WESTERN DIGITAL    1026

Hard disks from MDT that include a temperature sensor Manufacturer Model Size Notes MDT MD00600-BAEM 61.5GB MDT MD1200JD-00HBB0 120GB MDT MD1600BB-00GUA0 160GB MDT MD1600JB-00EVA0 160GB MDT MD1600JD-00HBB0 160GB MDT MD1600JS-00NCB1 160GB MDT MD2000JB-00GVA0 200GB MDT MD2500JD-00HBB0 250GB MDT MD400BB-00DKA0 40GB MDT MD400BB-00FJA0 40GB MDT MD400BB-00JHA0 40GB MDT MD800BB-00DKA0 80GB MDT MD800BB-00FJA0 80GB MDT MD800BB-00JHA0 80GB There are 14 HARD DISKs listed here.