On-the-fly monitoring HTTP requests on a network interface?

For debugging purposes I want to monitor the http requests on a network interface. Using a naive tcpdump command line I get too much low-level information and the information I need is not very clearly represented. Dumping the traffic via tcpdump to a file and then using wireshark has the disadvantage that it is not on-the-fly. I imagine a tool usage like this: $ monitorhttp -ieth0 --only-get --just-urls 2011-01-23 20:00:01 GET http://foo.example.org/blah.js 2011-01-23 20:03:01 GET http://foo.example.org/bar.html ... I am using Linux.