Now, we've decided to return to it. Using CSS3 and JavaScript (with some help from jQuery, of course), I've begun recreating Uplink's UI in the browser. So far, I've got a small proof of concept working with a dummy login/enlist box, plus a button that generates more windows. All the windows that include headers are draggable (using jQuery UI).
I thought I'd begin a sort of dev blog here to post updates every once and awhile. Hopefully we get something playable running this time instead of getting lazy.

The most recent demo of the proof of concept can be found here: http://orion.idlesoft.net/downlink/poc.html
And a milestone image, the first public proof of concept:

Also, you should probably be using Chrome if you want the best experience.