Thanks for the feedback. Yes, it seems I need to redesign the site to make it easier to navigate and feel less empty. I like your suggestions about adding popular topics.

Thanks for letting me know about the error. Right now Mathpendium has around 1000 entries, and so it is easy for some errors to slip through the cracks.

I was debating about whether or not to require an account to make a contribution. As you mentioned, making an account helps decrease the chance of spam. However, I am open to allowing anonymous contributions, and it is good to know that others would appreciate that.