[Avatar names when you mouse hover and map issues]

That'd be "Hover Tips".

View > Hover Tips > Show Tips, or ctrl + shift + T.

Very, very easy to disable that by accident. 

[Is Emerald viewer legal?]

The Other Resident is most likely misinformed.  As far as I know, the current GreenLife Emerald viewer does not have any code that enables copying or stealing of content (it does have internal texture copy protection, however, which might lead to some confusion).  But you already know that. 

And if the Other Resident plans to AR each and every person using Emerald, she has her work cut out for her.  And as a side note, how did the Other Resident know your friend was using Emerald unless the Other Resident was using a 3rd party viewer too?

[Is there a problem with ATI Radeon HD 4670 video card and SL]

Thanks for that Jira link.  I'm still having the same problem in the LL viewer and Emerald (and I can recreate it every time by camming around in a busy area), and disabling VBO helps at the cost of maybe 2 fps in performance, so it seems worth it.

Now, I did try to download new drivers from ATI, and not sure which version they were, but the moment I logged into SL the VBO bug went ballistic and was a hundred times worse than before.  So, if you ask me, don't update your ATI drivers as I don't think they fixed anything at all on their end.  Stick with the VBO toggle and save yourself a lot of headaches.