Hi,
verilog-AMS is a behavioral modeling language that is very useful to validate a concept, a system before even having the transistor level building blocs. verilog-AMS is very useful to be considered in a Top-down design approach. You can also use verilog-AMS to simulate your final chip within a mixed signal environment like AMS Designer. It allows faster simulations by selecting the most appropriate abstraction level for each of the analog/digital blocs to achieve the required accuracy. So we need both. verilog-AMS can't do everything on it's own. Besides, I don't know any synthesis tool that dumps physical design out of a verilog-AMS module. So waiting for this magic tool to be invented, I can only see a bright future for Custom Design
As for the links, I think searching 'Behavioral modeling' and/or Verilog-AMS on the Internet would do.
Cheers,
Riad.