Well, i've just had the idea of reproducing all the valve games possible -- sure, some people thought of it before, but I'd think it'd be a great thing to create a whole online system for those games.
So here's my ideas;
Base System
>> User registration (For banning of: Trolls, hackers?)
>> Downloads (Of course!)
>> Games list
>> Hosting, tools
>> Chat (IRC, perhaps?)
>> Demos (Later, big files ;_; (10mb + = :( ))
Games
>> Mods like: INSURGENCY, S&I, Synergy
>> CS:S, DoD:S
>> HL2, ep1, ep2, DM, etc.
>> HL:S, HL:DM, etc.
>> Portal
Now, we'd need some people that know every single square inch of every game we intend to design, a decal maker, and some good builders and modelers and scripters.
At my guess, to get the whole base system + 2 games would take 6 months if we have enough people working on it.
Now,
DISCUSE.