Seriously? Too many - will list a few.
"Current" MMO/Online/PC Games:
No MMOs, currently. I'm busy with college. My next undertaking will hopefully be the open beta of Star Trek Online.
Touhou: Immaterial and Missing Power
Touhou: Scarlet Weather Rhapsody
And several of the main Touhou series games.
On/off MMO/Online:
Phantasy Star Online GC Episodes I&II
Ragnarok Online
NeoSteam
Team Fortress 2
RF Online
Fairyland
World of Warcraft
Phantasy Star Online: Blue Burst
No longer playing MMO:
Luna Online [Lack of interest. I'm likely to back to it eventually,
though.]
La Tale (Grindfest,
otherwise excellent game, had a lot of potential)
Trickster (Lost interest due to eventual grind)
Fiesta (bug issues)
Florensia (Lost interest)
Rappelz (lost interest)
Perfect World (Pretty graphics, average gameplay)
Lineage II (lost interest)
Dream of Mirror Online (Just got bored)
Dragonica (Boring)
Ether Saga (Beautiful Environments, but I just got bored)
Ragnarok Online II (It's not going anywhere)
S4 League (not enough time for commitment right now)
And about 5000 others
Waaay too many console games, so I'll just list my favorites.
Tales of Symphonia
Tales of Symphonia II
Okami
Legend of Zelda: Ocarina of Time
Legend of Zelda: The Wind Waker
Legend of Zelda: Twilight Princess
de Blob
Super Smash Bros. (all 3)
Final Fantasy (mostly VI,
IX,
XII, CC)
Kingdom Hearts (I & II)
Gyakuten Saiban (Phoenix Wright and Apollo Justice)
Trace Memory & Hotel Dusk
Metroid Prime 3: Corruption
The World Ends With You
Pokemon Series
Sword of mana
.Hack
And about a million others.
(Okay,
that was more than a few.)