Youtube link for mobile viewing
If you're sitting there patiently, waiting for some proper S-off action for your HTC Sensation, it appears you might not have to wait much longer, as the folks at AlphaRev apparently have a properly hacked Pyramid in their hands. S-off, of course, is important for having full access to the lower levels of the device. Without it, things like custom ROMs are a wee bit more difficult to accomplish.
Anyhoo, stay tuned for when we see a public release. Until then, enjoy the video.