Next would be to populate the gadget with information from QlikView Server using Ajax. If you're running v11 you can use div-tag integration to make life a bit easier (see section 8.5 in QlikView Workbench manual). If not you need to write some additional javascript to handle the Ajax integration.
Attached is a small example that will fetch a single object from the QlikView demo site to get you started.
Note: This example is provided as-is and may or may not work in future releases.
If you don't want to build your own gadget I know there is at least one partner that created out-of-the-box gadgets (google QlikView + gadget).
Well, the gadget is just a wrapper for the page Flyout.html. This page shows an example on how to use the new div-tag integration introduced in QlikView 11 to simply integrate a single object in a html page. You should be able to launch Flyout.html directly in your IE browser (ignore any warnings about same-origin).
Authentication needs to be dealt with elsewhere. I didn't take this into consideration as it's outside the scope of actually creating a gadget (that's why I used the public demo site as an example).
If you want a full fledge gadget look at my tip above
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