I haven't had to call a web service from an SSIS package, but did call a package from a web service once that I blogged about, and today ran across a cool blog that outlines this. Pretty slick! This one is nice because he shows the subtleties of calling a particular type of web service, one that is created from WCF (.svc, not a .asmx service, the old kind). Remember that WCF is the framework that devs use to allow clients or consumers to hit all types of data sources via a service-oriented architecture. There are a ton of things on this, just do a Google! search and go create one!
Check out this post, I think you'll like it as I did. Good job!
Lee
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I'm going to pay you today for this coming week... so you have some walking-around money. You need to buy some toothpaste and cleaning up supplies to have back there. Get you some magazines and some hard candy... something to keep you busy at night.

Link: http://en.wikipedia.org/wiki/Windows_Communication_Foundation
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