I've been trying to check whether/when my SSD should be replaced but found that the information presented by gnome-disk-utility isn't helpful.  I was pointed here to begin on the quest to have this fixed.

The disk is:
=== START OF INFORMATION SECTION ===
Model Family:     SandForce Driven SSDs
Device Model:     OCZ-AGILITY2
Serial Number:    OCZ-[sniped]
LU WWN Device Id: 5 e83a97 ff826958f
Firmware Version: 1.25
User Capacity:    240,057,409,536 bytes [240 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 6
Local Time is:    Tue Apr 17 15:06:10 2012 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

MODEL:              OCZ-AGILITY2
FIRMWARE:           1.25
match smartmontools Drive Database entry:
MODEL REGEXP:       SandForce 1st Ed\.|ADATA SSD S599 .?..GB|Corsair CSSD-F(40|60|80|120|160|240)GBP?2.*|FTM(06|12|24|48)CT25H|OCZ[ -](AGILITY2([ -]EX)?|COLOSSUS2|ONYX2|VERTEX2|VERTEX-LE)( [123]\..*)?|OCZ[ -](VELO|VERTEX2[ -](EX|PRO))( [123]\..*)?|OCZ-VERTEX3|(APOC|DENC|DENEVA|FTNC|GFGC|MANG|MMOC|NIMC|TMSC).*|(DENR|DRSAK|EC188|NIMR|PSIR|TRSAK).*|OWC Mercury Extreme Pro SSD|UGB(88P|99S)GC...H[BF].
FIRMWARE REGEXP:    .*
MODEL FAMILY:       SandForce Driven SSDs
ATTRIBUTE OPTIONS:  001 Raw_Read_Error_Rate
                    005 Retired_Block_Count
                    009 Power_On_Hours_and_Msec
                    013 Soft_Read_Error_Rate
                    100 Gigabytes_Erased
                    170 Reserve_Block_Count
                    171 Program_Fail_Count
                    172 Erase_Fail_Count
                    174 Unexpect_Power_Loss_Ct
                    177 Wear_Range_Delta
                    181 Program_Fail_Count
                    182 Erase_Fail_Count
                    184 IO_Error_Detect_Code_Ct
                    195 ECC_Uncorr_Error_Count
                    198 Uncorrectable_Sector_Ct
                    199 SATA_CRC_Error_Count
                    201 Unc_Soft_Read_Err_Rate
                    204 Soft_ECC_Correct_Rate
                    230 Life_Curve_Status
                    231 SSD_Life_Left
                    233 SandForce_Internal
                    234 SandForce_Internal
                    235 SuperCap_Health
                    241 Lifetime_Writes_GiB
                    242 Lifetime_Reads_GiB


I also found the SMART attribute table here:
http://www.ocztechnologyforum.com/forum/showthread.php?75786-SMART-Attributes-for-Sandforce-SSD-s-%28Agility2-Vertex2-VertexLE%29

But gnome-disk-utitlity (which presumably uses libatasmart is showing me differing attribute names mapped to these numbers.  In particular the attribute 231 is titled "Temperature".

Unfortunately the values I retrieve with for 231:
=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   106   100   050    Pre-fail  Always       -       0/13859164
  5 Retired_Block_Count     0x0033   100   100   003    Pre-fail  Always       -       0
  9 Power_On_Hours_and_Msec 0x0032   100   100   000    Old_age   Always       -       5726h+51m+50.290s
 12 Power_Cycle_Count       0x0032   099   099   000    Old_age   Always       -       1733
171 Program_Fail_Count      0x0032   000   000   000    Old_age   Always       -       0
172 Erase_Fail_Count        0x0032   000   000   000    Old_age   Always       -       0
174 Unexpect_Power_Loss_Ct  0x0030   000   000   000    Old_age   Offline      -       80
177 Wear_Range_Delta        0x0000   000   000   000    Old_age   Offline      -       0
181 Program_Fail_Count      0x0032   000   000   000    Old_age   Always       -       0
182 Erase_Fail_Count        0x0032   000   000   000    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
194 Temperature_Celsius     0x0022   001   129   000    Old_age   Always       -       1 (0 127 0 129)
195 ECC_Uncorr_Error_Count  0x001c   106   100   000    Old_age   Offline      -       0/13859164
196 Reallocated_Event_Count 0x0033   100   100   000    Pre-fail  Always       -       0
231 SSD_Life_Left           0x0013   100   100   010    Pre-fail  Always       -       0
233 SandForce_Internal      0x0000   000   000   000    Old_age   Offline      -       1984
234 SandForce_Internal      0x0032   000   000   000    Old_age   Always       -       2624
241 Lifetime_Writes_GiB     0x0032   000   000   000    Old_age   Always       -       2624
242 Lifetime_Reads_GiB      0x0032   000   000   000    Old_age   Always       -       7232

do not allow me interpret SSD_Life_Left 0 as anything meaningful.

Hopefully this can help someone fix this information so that some type of life time estimate can be derived in the future...