It depends, it can be useful but many people rush into Web Services because it's the new thing and they really shouldn't. Martin Fowler offers excellent advice in his SD Magazine article this month,
http://www.sdmagazine.com/documents/s=7897/sdm0304a/sdm0304a.htm.
From the article which is very good advice indeed:
If both sides of the wire use the same binary
mechanism, an XML interface doesn’t buy you much other
than a jazzier set of acronyms. If you have two systems
built with the same platform, you’re better off using the
remote call mechanism built into that platform. Web
services become handy when you want different platforms to
talk to each other. My attitude is to use XML Web services
only when a more direct approach isn’t possible.
BTW, are you reading the Randy Ray book? How is it?
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