Anyone remember what the client was that someone had made where it was in full 3D and worked on Smaug etc?

No, but it's probably still around here somewhere, unless it's from that 3 month span or so that was lost due to the hard drive failure.

That was more like an 8 month span but I don't recall that having ever been hosted here. I only vaguely recall the client at all.

I've tried Googling but can't find it. :x

Not this is it? Probably not the original but it does mention SmaugFuss in the description.

That looks like it. Seems the official site has a lot of broken links.

http://web.archive.org/web/20080522133941/mudclient.skinhat.com/Smaugfuss

Emailed the author:

Glenn Linde ✆ to me
show details 10:36 PM (22 minutes ago)
Hi. The product was never popular so am not supporting it any more.