I’m not entirely sure whether it really counts as Interactive Fiction or just a form of Visual Novel, but I stumbled across Digital: A Love Story a short while ago and it really impressed me. The game, produced in 2010, is an 80s hacker romance/mystery. The entire interface is very similar to an Amiga or early Apple computer and is played via connecting to, downloading messages from, and posting to different BBSs. I found the experience to be fairly accurate - down the the sound of a dial-up modem connecting, and having to manually enter the phone number to every site you connected to without recourse to copy/paste.
On the downside there is a certain lack of interactivity involved. When you reply to a message or post to a BBS, as a player you never even see what it is that your character writes - you just get the responses the next time you dial in. There are a few hacking/phreaking related puzzles (though you don’t need to know anything about 80s cyberpunk culture to figure it out), but beyond that you’re basically following a story told to you through the messages you receive. This is really the only sort of “exploration” the game provides. You’re ALWAYS a guy sitting at a computer dialing out to other computers.
I’m interested in getting some other opinions on this. It’s freely downloadable from the site I link to above, and there’s a longer review of it here if you need a bit more prodding before bothering to download it. I’m particularly interested in hearing opinions regarding whether or not it qualifies as Interactive Fiction.