[1] Here are all three interactive pieces made with Undum:
* The Play, A dress rehearsal gone horribly wrong, by Deirdra Kiai http://squinky.me/theplay/
* Almost Goodbye, by Aaron A. Reed http://almostgoodbye.textories.com/
* The Matter of the Monster, by Andrew Plotkin http://eblong.com/zarf/zweb/matter/
As for moving to the Web, Parchment has done a pretty good job of doing that with the Z-Machine:
http://iplayif.com/?story=http://mirror.ifarchive.org/if-arc...
Also, I think that using a programming language with English grammar is not the best idea. If anyone is interested in writing text adventures, there's a book called "Land of Lisp", that teaches you the basics of lisp on the example of creating a simple text adventure.
I think it's a very fun way to learn lisp, and to write the game, right now I'm working on my own and it's really cool =)
There's still a lot of interactive fiction being made today, and you can find a lot of old and new games on the IF Archive[0]and IFDB [1]. New tools like Twine[2] are also allowing new forms of interactive fiction - "The Uncle Who Works For Nintendo"[3] recently showed up on the HN frontpage and was built in Twine.
Finally, I'll point out Inform 7[4] - a language designed for creating text adventures. It's all natural English grammar, and is really interesting in terms of design and parsing. I would highly suggest learning a bit of Inform and writing a small game in it, it's a very weird process. Also it will help you understand some of the jokes in _why's printer spools.
[0] http://www.ifarchive.org/
[1] http://ifdb.tads.org/
[2] http://twinery.org/
[3] http://correlatedcontents.com/misc/UWWFN/UWWFN.html
[4] http://inform7.com/