When working with web services you sometimes just want to make a
quick "lets hit it, and see what it does" test.
For that purpose WCF Storm is the must-have
tool, which a fellow developer recently pointed out to me. It
quickly generates a proxy and lets you specify parameters of
complex types, add custom headers and much more (none of
which the older WebServiceStudio I used to
use could do)... It also lets speaks WCF.
The lite version does everything you are likely to need. The
paid versions contain functionality aimed at developers wanting to
integrate their web services in test or build routines, or
performance test them.