How about browser-based but mostly graphic rpg ? As far as I know, it requires pretty low-average bandwidth (unlike those crazy Flash games and some others).
and, this one is quite similar to Ragnarok Online if you have ever played that game before...
Here's the link :
http://ab.igg.com/main.php
The game called Aurora blade, it's pretty much Ragnarok online (korean mmorpg) made into browser-based.
I played for a bit, but I haven't got time recently so I've sort of abandoned the game.