Periscope's updated their Folio booklight case to fit the Kindle 2, which still houses a little memo pad, a pen, and a retractable light for covert reading.

At $50 it's not cheap, but since Amazon charges $30 for a book cover already, you're only really paying $20 more to be able to write things and read on the toilet with the lights off (twin LEDs!). The downside is that you need to use three AAs to power the thing, and combined with the pad, the pen and the weight of the notebook, the whole contraption has multiplied the weight of the Kindle 2 to the point where it's heavier than a regular book. [Periscope]