I use the SWT Browser control in my Eclipse RCP application. On Linux Ubuntu 10.10 this depends on the user having installed xulrunner-1.9.2. This works fine.
Simply installing the "hotot" (Twitter) App via Software Center, which drags WebKit along, did the trick for me. - A "sudo apt-get install -y libwebkitgtk-1.0-0", or build from source as per https://help.ubuntu.com/community/WebKit, would probably work as well.