I know the FIR approach, I have seen IIR, to, but I'd like to know if it's possible to implement a Hilbert transformer in analog domain, i.e. with integrators instead of delays. Is it possible? If yes, how?
 After some searching on my own, I stumbled upon an answer in sci.electronics.design - "Analog delay??" (I'm not posting the link as it seems it involves some character string and I don't know what influence will that have). A simple search will do.
Still, this involves a translation of a digital delay into its analog counterpart, clock, etc, no continuous-time values. Could this mean that there is no other way to do it (analog)?