I tried the Seam demo (http://www.seamframework.org/Documentation/RunningSeamExamplesWithApacheTomcat)
Find hotels did not do anything.
http get url:s or does the framework rely on the
http post) ?
You can write web app's in the framework as you describe.
However most of the examples (and I guess most of the people using seam) will be building rich style (ajax etc) web app's.
You could stick to a plain JSF client with the seam IoC stuff if you required.