This is the one I just bought:
http://www.cssauction.com/product/__...-inverter.html
Picked it up from T/A for something like $30. It plugs directly into a 12v socket, so there's no wiring to mess with.
The inverter runs my laptop, usb hub, external hard drive, bluetooth headset charger and printer with no problems whatsoever. I charge my cell phone on the 12v adapter in the front of the truck. I do have a small APC battery backup for everything. The only reason I have this is because the battery in the notebook is dying (about 1 1/2 years old) and when I start the truck, the inverter shuts off for a few seconds. The software for the battery backup shows pretty much constant 110 voltage, so it's a pretty stable inverter. Well worth the money in my book.
I have a 1,500 watt inverter, but just haven't had the need to have it installed. I'm home enough that I don't worry about having a microwave, and the Rubbermaid 12v cooler does a great job at keeping my drinks nice and cold.
You can get a 12v coffee maker, but I hear they're pretty slow. I've never used one, so I can't comment on it.