[iNik]

NOTE: I've stopped developing this script because as of OF 1.8 (currently in SneakyPeekdom), this functionality is built-in through omnifocus://add URLs.

However, here is a snazzy bookmarklet that does the same thing with OF 1.8, including saving the selection. Just drag the link below to your toolbar:

Send to OF

Or the raw JS:

javascript:window.location='omnifocus:///add?note='+encodeURIComponent(window.location+'\n\n')+encodeURIComponent(getSelection())+'&name='+encodeURIComponent(document.title)