Poems for Insects is now formatted a little bit better and has one more poem. I’ve written others since then, but they are being saved for Poems for Bacteria, which is due for release at some non-specific date in the future.
If you already own PfI, you should be able to download the update for free. If you haven’t read it yet, I recommend you get it, but I wrote it so I am biased. Please make this decision yourself.