Street Rats is my game of cyberpunk "intrigue". I'm considering dropping that description, as it's vestigial: there is Deus Ex style conspiracy stuff going on, but it's focusing more on the action and feel. We had a decent playtest tonight, even.
The core mechanic of the game is a single d20, with margins of success/failure determining the degree to which actions succeed/fail (duh). It's got rapid play, single die resolution, and so far it's been a hit with the ladies*. There's a lifepath-esque character creation system, with lots of flexibility. It takes somewhere around fifteen to thirty minutes for character creation with a novice, and I can do it a little bit quicker than fifteen if I'm having a good day.
The system itself falls somewhere between the d20 system (d20 with higher rolls being better), Twilight 2000 (a lot of the combat systems are loosely inspired by T2k), and Shadowrun (Margins function pretty similarly to Successes/Glitches). It's slower than base d20, but faster than Shadowrun as a general rule. The game definitely has a normal->heroic trend, but unlike in Shadowrun there don't seem to be immortality cues; people become dangerous quickly, but are not likely to become impervious to damage: getting hit with a rocket or a railgun will ruin any character's day, even augmented combat monsters. Big guns are balanced by a size system that makes them both difficult to conceal and hard to carry, and legality and availability are major concerns to most characters who want big-ticket weapons.
The main place I indulge my desire for complexity is the combat system; there are somewhere in the area of 60 firearms (or will be once the game is complete, at least) in the main rulebook, with rules for automatic, rapid, and single shot firing, as well as special rules for energy weapons with pulsed or beam operation. The end result is that there are a lot of weapons that feel distinct from each other: firearms also respect caliber restrictions, meaning that ammunition and magazines may be compatible between firearms (or might not be), and most weapons of the same caliber have similar performance. Once weapon modifications are in, the game will be very diverse. Some of this comes from the fact that the last big project I worked on prior to Street Rats was the unofficial for Eclipse Phase.
One of the focuses of the system is raw speed, and this is shown off in most mechanics. Hacking is intentionally designed to be fast; it takes place in the same time as combat, and involves simple single rolls, so it doesn't fall victim to the fate of Shadowrun's bulky hacking that was a dungeon crawl in and of itself. Vehicles, chases, and social skills are also simplified so that most interactions take place using one roll or rolls each turn, keeping the action fluid in combat. Characters who get multiple actions in each turn don't do a lot of bookkeeping: they can't take two actions in a row (unless they're taking them after everyone else), which keeps them moderately balanced, but they don't have to track initiative numbers or things like that like in Shadowrun.
The setting falls in a niche between post-cyberpunk and traditional cyberpunk. Deus Ex is a major inspiration, as is Eclipse Phase and a selection of classic cyberpunk. Street Rats is set in 2098, in a post-WWIII future. Players take on the role of Rats, individuals who slip through the cracks of universal surveillance and identification databases and who are often used as deniable assets by corporations, governments, or wealthy individuals. Combine this with large swaths of wasteland for a little road warrior action and nascent post/transhumanity, and it's a recipe for some hectic adventures.
Right now it's in Alpha (2.1, with 2.2 coming on Thursday), but it's about 70% feature complete, and some of the missing features are things most people won't notice (space travel, for instance).
You can find Street Rats over on , and it has a and its own .
*Technically, we have a chronic lack of paired X chromosomes at the playtests, so this has never been tested. I am not responsible for taser or pepper spray related incidents related to the use of Street Rats.