How can I read my hard drive’s SMART status in Windows 7?

HDTune works on Windows 7 too.

A blog-post reference.

HDTune is a good commercial software. Speedfan works too, which is free. The trick is you will need to start as Administrator under Windows 7 to see the hard disks. It also works in x64.

GSmartControl

GSmartControl is a graphical user interface for smartctl (from smartmontools package), which is a tool for querying and controlling SMART (Self-Monitoring, Analysis, and Reporting Technology) data on modern hard disk drives. It allows you to inspect the drive's SMART data to determine its health, as well as run various tests on it.

Free open source cross platform GUI for smartmontools.