Can't help but notice that the problem with the "direct interaction" which people are talking about is it's really NOT something you can control.
For me, way back in Series 2 of "Personified Math", I decided to have at least one link-per-update, going somewhere else on the web, either to define a mathematical term, a pop culture reference, to promote someone else's work out there, or simply to have something fun to see. I kept that up for, I'm not sure, at least a year? In one of my low times, I didn't bother, then questioned aloud whether anyone was even following the links, and as the silence continued, ultimately cut back to just doing it occasionally. I've kind of resumed it with the webcomic version of the serial because... yeah, I don't know.
That is something that resurfaced with "Epsilon Project" too, largely because every third sentence Alice says is a pop culture reference of some sort. And it must have been pervasive enough that the person who wrote my "April Fool" entry this year picked up on it, because s/he included the same sorts of links in their entry for me. The downside, of course, is that as the web changes, links die... but I think ChrysKelly has been the only person to actually say anything to me about that. From what I can tell in the WordPress dashboard, the majority don't click.
About Polls: The interactive fiction of "Epsilon" makes polls a necessity (it's vote-for-plot), and since it is by FAR where I get the majority of my comments, it might even be the thing that drives people to comment in the first place. That's partly why I like WordPress, it has the built-in poll feature that I can link into the posts. I've also done a couple Twitter polls related to the personified math, and while the response rate is HUGE by comparison (ie- more than 10 people), I don't think any of them followed me back to the later post.
About Time Travel: I mentioned this in some other thread but forget where. In "Time & Tied" there was a set of 4 episodes where a character was jumping around their timeline. So while the narrative went through linear time, Friday-Saturday-Sunday, I included a set of links that allowed reading from Carrie's perspective instead (more like Fri-Sat-Sun-Fri-Sun-Sun). And both ways of reading it SHOULD work. I also threw in a link from Part 1 to Part 27, allowing throughput on Grade 9 Carrie... maybe 1 person in 30 follows that link? They never stick around though. (Unless they were a heck of a reader, burning through 27+ parts in one day.)
Should I mention my drawings? No, I probably shouldn't. All that to say, yes, I do try to take advantage of the web medium. The newspaper article idea sounds interesting, I'm not really sure how A/V would work, and I wonder if a forum would cause new headaches in moderating. Some webcomics (like "Darths and Droids") have that sort of thing though. Incidentally, ChrysKelly, you probably want to update your .sig here, since you're now live and can link and such. ^_-