6. A user interface, produced by, and defined on, a computing device, comprising: a text entry area that permits entry of text; a free floating field residing inline with the text, the free floating field presenting content derived from source data or referencing source data such that upon modification of the source data, the free floating field automatically re-derives the content and presents the re-derived content, wherein the re-derived content is integrated into the text, and wherein selecting and applying formatting to the text applies the formatting to the re-derived content in the free floating field; and a second free floating field residing inline within the text, the second free floating field created in response to a selection of at least a portion of the text, and the a second free floating field configured to contain the selected portion of text.
6. A user interface, produced by, and defined on, a computing device, comprising: a text entry area that permits entry of text; a free floating field residing inline with the text, the free floating field presenting content derived from source data or referencing source data such that upon modification of the source data, the free floating field automatically re-derives the content and presents the re-derived content, wherein the re-derived content is integrated into the text, and wherein selecting and applying formatting to the text applies the formatting to the re-derived content in the free floating field; and a second free floating field residing inline within the text, the second free floating field created in response to a selection of at least a portion of the text, and the a second free floating field configured to contain the selected portion of text. 8. The user interface of claim 6 , wherein the free floating field exhibits a change in appearance when selected for editing.