The tomatoes are doing great:
The cauliflower, brussels sprouts and broccoli are still leggy, although they haven't gotten any leggier. I'll end up needing to stake them when they're transplanted. The peppers are getting their true leaves. The artichokes are doing pretty well. The cantaloupe had a little problem where the initial true leaves withered, but they have all since grown new true leaves that look pretty healthy.
We've started taking the plants outside for an hour or two at a time to get them hardened up and used to the outdoors before transplanting them.