To Prok's list I'd add send and take a tp offer - but walking, talking, flying perhaps, tping, searching, shopping, changing clothes and hair, making friends cover most of "need to know" early.

It's what we teach new students, pulling them out of OI asap so they can get some face-to-face time. We don't teach all of those skills at once, and for students we add uploading textures, rezzing prims, adding textures, notecards and scripts to prims so they can make displays quickly (we give them the scripts and L$ for those bits). In terms of retention - we basically keep 100% for the duration of the course. We keep more than 10% who use SL for other things for more than a month, so we probably do something better than OI manages.

I understand why LL don't want to staff OIs and HIs continuously, but they have hundreds of educators in world, you might have thought some of the skills from there would be used. Ironically, all the educators I know have abandoned OI and HI and do it themselves, on either a big scale, or a per-class scale. It's got to say something about the perceived quality that LL should listen to when teachers choose to do extra work than use existing resources.