Single-seater formulae - what are they all?

[Mathias]

How do all!

I'm just in the middle of doing some research, by way of diverting myself from real work, about the route that drivers take on their way to F1, and my efforts so far have revealed that there are an awful lot of junior single-seaters categories out there that current F1 drivers have driven in, and yet very little information about the serieses themselves, the differences between them, and how they sort of relate to each other.

This is made especially difficult by them seeming to change their names on a regular basis.

Is anyone aware of a website that succinctly explains all the different single-seater serieses used across the world? It can't be too much to ask, surely!

I mean, am I right in thinking that Formula BMW, Formula Vauxhall/Opel and Skip Barber Formula Dodge can all be thought of as the same level of racing - i.e. they are all entry-level, single-make, slicks and wings series?

But what is Formula Asia? Is it a precursor to FBMW Asia, and hence another entry-level, single-make, slicks and wings series?

Is Formula Nissan 2000 the same as World Series by Nissan, and can you assume that World Series by Renault (also known as Formula Renault 3.5) is pretty much the same level?

Is Formula Holden the same as F4000, and is it the same kind of level as F2/F3000/GP2?

Doesn't anybody regulate all these serieses?