Dec 5, 2012 : Please note that this post contains out of date information and is in need of revision. May we suggest these other fine links?
The Differences Between ABS and PLA
3D Printer Filament Buyers Guide
These days there are a number of personal 3D Printers to choose from. Personal, hobby, open-source, accessible, desktop, or whatever else you want to call them; they are a new breed of 3D Printers. A 3D Printer you can own and operate in your own home, producing before your eyes anything you can imagine with materials an order of magnitude cheaper than previous commercial 3D Printers.
Below are some statistics and descriptions of currently available or soon to be released personal 3D printers.