Assuming you have two qListviews on the same page: qListview1 and qListview2. Create a hyperlink in qListview1 on one of the columns you want the user to select (ezEdit/display fields, Link to). In the hyper link, reference the url of the current page and a url parameter value that you want to pass to qListview 2 for example: /sites/demosite/default.aspx?PassedID=<%ID%>.
In qListView2, you will define a CAML filter that uses the passed url value (PassedID) to filter the list. ezEdit/CAML Filter/Add Condition
FieldName: ID (could be any key you want to filter qListview2 on that can be found in qListview1)
Operator: Equal to
Value Source: HttpParameter
Source Name: PassedID
Now, when the user clicks the hyper link on qListview1, the page is refreshed and the url is passed to qListview2 as a http parameter so qListview2 is filtered based on the user's selection.
Curtis Kelly
PM, Quest Web Parts for SharePoint