The iGoogle gadget with gadget-manager functionality.
Layout : Smal horizontal row.
1) RSS feed manager.
turns on or off rss feed gadget (adds to your iGoogle page, and specify some hardcoded position) and specify rss from [url removed, login to view] as feed source.
2) Theme manager. It is a selectbox with 10 hardcoded iGoogle's theme names. By selecting some theme, it will be applied to your iGoogle page automatically.
Code must be well-documented.