I opened Impulse and I can see it there.

Well this is very odd. My Object Desktop sub is up to date, I've re-registered Drive Scan in Impulse and the registration was successful, I've even re-installed Impulse but without luck. Everything else is listed - as far as I can tell - but not DS. I'm beginning to suspect Stardock have removed it.

I renewed my OD sub in November 2009, but I've certainly downloaded Drive Scan since then. I need to do it again now because I've just completed a clean re-install of Windows 7. The annoying thing is it shows up in Impulse on my Laptop, and with an update available.

I must say I'm disappointed to discover it's been "retired". I've always found DS to be very useful.

I'd just like to take a second to point out this "Last Update" field in Impulse refers to the last time the app's configuration was updates.  Drive Scan hasn't had any code changes in a long while, and most likely was updated for testing purposes.