Experience with Eclipse Phase: None. I have most of the Eclipse Phase supplements but I've never played, and I'm still close-reading my way through all the core rules.
Experience with RPGs in general: I've been playing everything from AD&D 1e to Mutants & Masterminds 2e for 20 years, and DM'ing half of them for almost 10 years.
Experience with transhuman concepts: I've been reading the stuff on Orion's Arm for years. I have a first-edition copy of the original "Engines of Creation".
Availability: I should be available any evening except Thursday or Friday. Since I'm not working right now, my schedule is, ahem, flexible. I'm looking for a chat-based online game, not a PBP.
Interests: Your bog-standard Firewall Sentinel campaign would be enough for me, I need to get my feet wet in Eclipse Phase so I can eventually run it. Gatecrashing would be all right too. Pretty much my only limits are 'I am not interested in dark-gray-or-black-on-black everybodys-a-bastard-there-is-nothing-good ultra-cynical morality type games'; even in a complex world with shades of gray, I like to have a gameworld that supports a character who believes in things. Or to use a Mass Effect analogy: nothing darker than a Mass Effect 2 80% renegade/20% paragon run, please.
My two vague general concepts right now are 'memory-edited math genius who's a fish out of water but technically brilliant with all sorts of hacking and codebreaking' and 'an ex-soldier who just barely got off Earth during the Fall and has been sort of aimlessly going around since'. Also, while I can imagine myself ending up in any faction but the Jovians or the Ultimates, I lean more towards the autonomists.
Software: I don't have a microphone. I really don't want to install any new chat clients if possible, my machine is cluttered enough. The online RPGs I've been in so far, we used an AIM chatroom. I've never used Roll20 but I'd be willing to log onto that because it's just browser-based.