Those look very nice! Unfortunately they use the script tag, which we cannot easily trust due to its capacity for use in identity theft and other malicious activities. We hope to make these gadgets available when we get the security implications sorted out.
They are novelty widgets that for example give you your horoscope reading for the day, the quote of the day, this day in history, googlemaps, google calender, date and time, phase of the moon, and little games to play. Some would call them sidebar “tat” others would call them “real kewl sheet”.