This thread reminded me of RuneScape, which is an MMORPG. I recently started playing it again out of nostalgia, and, while it doesn't have quite the same appeal as it once did, there's still a certain charm to it.
I'd really like to play Albion, Arcanum, and/or Final Fantasy VII again at some stage. The respective story lines were quite intriguing and I remember enjoying every minute of gameplay. These were also some of the games that got me interested in RPGs.
Another game is Heroes of Might & Magic III (and IV to an extent). I have fond memories of playing both games with my brothers and two of my cousins.