If you make a list of the taxa, in the list, you can add a note or comment to each taxon. I’ve been known to paste the web addresses of observations I like under their taxa, and then you can keep up with them.
That’s neat, I didn’t know it. I would use a tag, though. The only thing is, it has to be something easily remembered, because you don’t have a list with tags used and sufficiently different so the search doesn’t find the word in comments or place names.
You can restrict projects so that only you can add observations to them, but you can’t stop other people from seeing what is in them. You could add observation fields to other people’s observations, but some people don’t allow that.
Thanks for the ideas, everyone. I thought there might be a simple way to make lists of observations (more than the one list created by tagging favourites), but it seems like there isn’t one. I don’t want to clog up the system creating more projects than are needed. I think I’ll just bookmark the pages like @pisum suggested.