I figure a list of Steampunk MMOs would be a good idea for those into those sorts of games.

I guess I'll name a few off the top of my head

http://www.worldofwarcraft.com/index.xml

It has steampunk elements all over the place. Mechanical clockwork pets, steam powered robo mounts, tanks, flying machines, steam powered motocycles, most of those from the engineering profession, including goggles.
If you play, my brother demands you play on the Farstriders RP realm x.x



Fly for Fun

http://flyff.gpotato.com/

A pretty obscure free MMO, I haven't played in years but did like it. Giant cogs as part of the landscape, airships, and best of all hoverboards.



NeoSteam

http://neosteam.atlusonline.com/

From Atlust comes Neosteam. I didn't play long as I was just in the open beta, and it didn't have SWAD movement, but overall it was pretty nice and being free, a good MMO to get your feet wet in.