A great general look at scooters and scootering from fellow (maybe ex-?) Blur rider Nathaniel Salzman. Very well written and covers just about everything I’d say.
My only minor quibble: He says (in bold, thankfully), “Riding a scooter is 100% as dangerous as riding a motorcycle. Period.” I agree completely, the similarities of scooters and motorcycles are more important than the differences, so the first section about the differences, while well-written, is given too much prominence in its placement. But as I said, that’s a minor quibble. Definitely bookmark this one to mail to friends looking for their first scooter.