These two smart data fields have been documented by OCZ:

http://www.ocztechnologyforum.com/forum/showthread.php?t=57898

Field 208 (0xD0) is "average block erase count".
Not sure what the scaling factor is, though, since it's
only an 8-bit field and the cells are good for 10000 cycles minimum.

208 Spin_Buzz 0x0000 031 000 000 Old_age Offline In_the_past 0

Field 209 (0xD1) is "Remaining drive life in %% by erase count".
So probably (field_208 / 10000) * 100%, except we know field_208 hasn't enough bits.

209 Offline_Seek_Performnce 0x0000 100 000 000 Old_age Offline In_the_past 0

Fields 001 (read error rate) and 009 (power on hours) are also valid.