Newbie Q: SOAP in the real world

[kynn]

Hi!  I'm sure this is a FAQ, but I have not been able to find the
answer.  I'm relatively new to SOAP-based web services.  I have seen
demonstrations using simple toy examples, but they don't give me a
good sense of how mature and presently viable this technology is.  Can
someone point me to a list of useful, real-world SOAP-based web
services?  (I've heard a few times that Amazon and Google have such
services, but I hope there are a lot more.)

Thanks!

Kynn