[bruce_one]

(iirc) It was originally slid.es and the slides.com domain was added later, I know it's not an answer to your exact question, but slid.es was a pretty good start point too :-)

(It became a defacto go-to tool for slide decks for me because it was so memorable)

[hakim]

You’re absolutely right. We started as slid.es which is still my personal favorite domain :)