I setup a whole bunch of logins on the Scratch website using the name of our club followed by the name of a sweet (twix, mars, rolo, etc). I'm going to give out these usernames at our first session (next Thursday) and write down who got each one.
I'm with you Rowan. I want to be using Scratch 2.0 and giving the kids the opportunity to share their work. But do be ready to fall back to 1.4 if necessary. One school I run a club at had very slow internet access and getting everyone logged into the web version of Scratch all at the same time brought everyone to a standstill.
John