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@Velocio
CJay, the problem is that most FG and SS bikes are not primarily concerned about weight. It's a secondary concern at best.
Main concerns by type:
Track frames = stiffness, rigidity, conformance to rules (UCI, NJS, etc).
BMX = strength and ability to take abuse, reasonable cost
CX = strength and ability to take abuse
Polo = ability to take abuse, low cost
The only disciplines in which weight outstrip all other concerns as being the #1 priority is road racing (including TTs and criteriums).
And for that, there is a fantastic resource on the internet that records weights of frames, components, etc. It's called weight weenies: http://weightweenies.starbike.com/
You're asking us to consider frames which never had weight as a primary concern, by a factor that isn't critical to a bike's performance within one of these fields.
Sure you can build an urban fixie and spend a lot of money to get a light bike... but you haven't actually indicated that you have a cost concern either.
If the assumptions above hold, that you want light and don't care for cost, then why not just go and have a custom frame built in carbon to your specifications? No? Too expensive. Well you're hardly providing enough information to help you here.
You don't even say how you want to use the bike, yet FG & SS covers so many different disciplines. I'm confident you don't mean BMX, but you haven't bloody said.
Sheesh.
You want us to help, you provide not enough info, and you don't even understand the size of the question.