Hello from Paris. The first thing I noticed since the last time I was here last year is the new Velib bike rental system.
Riders take out a subscription (a fee paid by credit card right at the machine where the bike is). Subscriptions can be purchased by the day (1 euro), week (5 euros) or year (29 euros).
After that, the bike rental is free for the first half hour and a couple more euros for subsequent 30-minute periods.