Regular Kindle
Pros
EXCELLENT for reading books
Works in the sunshine even with glasses
Light and tiny as it isn't backlit
With the wi-fi off, the battery lasts for 4 weeks
Cons
With no light, you can't read it in the dark in bed at night
Not good for doing emails or surfing the web
Kindle-Fire 3G
Pros
You can get emails, surf the web and play games
Lit up so you can read at night
Affordable tablet vs competition
Cons
Doesn't work well outside in the sunlight and especially with sunglasses
A bit heavier/bulkier
Much shorter battery life than the regular kindle
Elle