Online gaming has started to become a more prominent form of gaming style. Especially with "gamers" growing older and moving to isolated areas of the world. The online gaming takes many forms: PBEM, IRC chats, list groups, etc. Each has its own flavor, pros and cons. Listed below are a few links to good support websites to further your experince.
OpenRPG - Open Source Roleplaying Site - Free Online RPG Software
GRIP - Cheap Online RPG Software - Comes equipped with game scheduler.
RPGRegistry
- A registry of players, DMs, and games. Check it out!
Much of my SciFi gaming online is centered around the use of the pre-d20 system of Alternity. Though currently nonsupported by Wizards of the Coast, the fan base is plentiful and vibrant. Please check out alternity.net for more information. I am quite active in their forum section -- games particularly. These are some of the characters I currently run (or have run):
Rubiks'Nox
the Dark Templar, Protoss (dead version) (Sav's)
Rubiks'Nox
the Dragoon, Sentient Protoss Robot (Sav's)
Elvanshalee
Noquar, Zerg Mutant Ghost (Sav's)
Sabyr,
Cat-like Robot (Sav's)
Zul'monji
Urik-rabi, "Wolfman" (TMT)
Arthas
Thrall, Psychic Doctor (TMT)
Ghul'dan
Urik, Weren Firebat
Roanoke
Obliete, Goblyn "Alchemist" (Magi & Mutants)
DDr.
Iggwilv Inverness, Combat Medic (Starcraft)
Frau
Kinder Von Weissenberg (Underworld)
Jazpharaoh
Warcraftus (Gamma World)
Soon I shall begin working on my own online game emtilted, Fields of the Fallen. A war ravaged setting using the d20 D&D rules based on a variety of "Gamma World" like settings and ideas. Such as Dark Sun, Gamma World, Thundarr the Barbarian, etc.