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Been playing this game, finally hit V1. Called Dystopia. Check it out -- it's TIGHT!!!

(link and description from their website)

Dystopia places the player into tense combat situations in a high tech world spanned by computer networks. As either Punk Mercenaries or Corporate Security Forces the player will fight through the physical world to gain access, via jack-in terminals, to cyberspace.

Cyberspace is a three dimensional representation of the world's network. Inside cyberspace players will launch programs to hack into systems linked to the physical world while fighting off enemy hackers and defending critical systems. Gameplay progresses through inter-linked physical and cyberspace objectives, some are completed in either the physical world or cyberspace, others only by a well timed combination of the two.

Whether the player is a heavily augmented combat mercenary armed to the teeth with the latest in firepower, or a twitch reflex cyberdecker racing to infiltrate a cyberspace node; they'll be immersed in an action packed battle. Only through skillful use of the high tech arsenal we're making available and intelligent team play will players truly jack-in and kick ass.
so its kinda like tron with the little people inside the system? or something totally different? woah never mind that looks awesome, is it free?
It's a free mod if you own HL2. You have to download the Source SDK Base, and download Dys.

The cyber space is pretty kewl, you hack the systems (pretty loosely defined as a hack - you encrypt, decrypt, get past firewalls, set up firewalls, fight your enemies with EMP type weapons).

All while hoping someone doesn't find you jacked in in Meat Space, and pigsticks you with a katana...