I think that they are significant. I'm saying this as someone who grew up during the time period when parents had little to no idea of what sort of deranged things were on the internet. A kid could erase the history and clear the cache and their parents would be none the wiser. I'm not in general a supporter of censorship on the internet but I saw some things that are frankly ridiculous for a 7 year old to see. I'm not talking about nipples or vaginas either, you all know that there is some really weird stuff out there. There is a large gray area but I strongly believe that there are things on the internet that an elementary school child shouldn't see.
But I really like what you're saying though about making it more interactive and unique and adding a community.
Make something more unique, like a quiz where the kids have to find the answers on Wikipedia. Or custom made videos a la sixty symbols or kahn academy that explain something. Or a site like reddit for kids for sharing "hey this is cool!"-stuff. Or a community site where kids can work and discuss projects they're working on. As a kid I'd have loved a site for discussing and sharing experience with other kids how to make the best water rocket, making a water electrolysis apparatus, making trebuchets, making websites, fun chemistry experiments etc.
B seems like a good idea to me, though I wonder how many competitors already exist. A simple tool where multiple people can create a tree of tasks and indicate that they are working on a certain task and set expected time of completion would be useful to me. Though for me personally the collaboration aspect wouldn't be so useful, more useful would be something tailored to freelancers: a website that published certain parts of the task tree password protected to help show clients what you're working on and what progress you're making. Of course you're in an incredibly crowded space here.