So many things. A lot of them for personal entertainment, but increasingly for useful other stuff too.

I used it to help brainstorm talk titles and abstracts for a talk I was proposing the other day. What I ended up submitting was entirely written by me but was heavily influenced by the ChatGPT conversations.

https://til.simonwillison.net/macos/sips - I used it to figure out how to convert webp to PNG on macOS, and learned about an entirely new built-in command.

I often use it as a thesaurus - "what's a good word / term for X?"

I'm self-employed and a journalist asked me for my job title, which I don't have. So I brainstormed some ideas with ChatGPT.

I pasted in the output of a SQLite "explain query plan" query and asked for an explanation - which helped me figure out enough to write a section of this TIL: https://til.simonwillison.net/sqlite/subqueries-in-select

This is just from the past few days.