The Kindle Fire is a back lit device meaning even in the dark, you can still read without a light. It the same type of screen as found on your computer monitor or cell phone. However, from what I have read, the Kindle Fire screen is top of the line and easier on the eyes than other standard cell phone screens. I would highly doubt a lighted version of any type of cover to ever come out for the Kindle Fire.
Daniel, there is no additional monthly cost for the web-browsing, since the Fire is WiFi only. If you decide to sign up for the Amazon Prime membership to stream the movies and tv shows Amazon has, then you would pay $79 a year. There is no separate keyboard, but there will be a virtual keyboard you can use, just like on many touch screen cell phones.
The Kindle Fire does have a micro USB (or maybe a full size USB) for charging the system much like the current Kindles. I could see a keyboard being released by Amazon later if there is a demand for one.
@ R. Rousseau: The Kindle Fire does NOT have 3G so you will have to have Wi-Fi access in order to update via Whispersync. However, you can still read the books that are already on the device without a Wi-Fi connection, Linda.
If you have a normal broadband internet connection you can add a wireless router to your internet system very cheaply for as little as $30 to $90. Check out NewEgg dot com or even Amazon and do a search for Wireless routers. You just plug it into your RJ45 network connection on your cable modem. This will give you the WiFi that you need to allow connections on your new Kindle Fire or other models with WiFi connectivity. Just a thought for those who don't currently have a source for WiFi connectivity.