TechGremlinTony over at the OCZ forums has released version 0525 of the TRIM utility designed restore the write performance of the Vertex series drives by resetting the write blocks.
This new version appears to work correctly for me, the previous version 0422 didn’t do anything when run even though it said it completed successfully and the original version corrupted many files on my drive.
It was run using Windows 7 x64 RC (7100) using IDE mode with the intel IDE driver loaded.
You can view the forum thread and find the file here.