When we posted on the work-around for enabling the Netflix app on unsupported devices, more than a few of you weren't thrilled to hear that the fix didn't work on the Thunderbolt. We knew a fix would come eventually, and now we're happy to report that the developer community has delivered; they've found a way to get the Netflix app working on the Thunderbolt. Unfortunately, there is a bit of bad news, too: it only works on devices that are rooted and running a Gingerbread ROM.
If you fit that criteria, the instructions are pretty damn simple. As always, its highly recommended that you fun a Nandroid backup beforehand in case anything goes awry. To install, all you need to do is download and flash the "Minimal" patch. There's also a "Complete" patch that takes things a step further in case you're one of the unlucky few that the Minimal patch doesn't work for.
Big thanks to rmk40 for the patch; if you use it, consider saying thanks by buying him a beer, or at the very least, following him on Twitter. As always, any support-style questions should be directed towards the source thread, as they can provide the best assistance.