I have always wanted to do this, but inverter prices/quality were not good enough, and the idea of dumping a whole computer into my car was displeasing... Enter the HTC Evo! One thing to keep in mind. Driving with video in view of the driver is ILLEGAL in most (if not all) states. (more on that later) Part #1: Tech Needs Total Cost w/VGA Monitor: Appx $113 + Monitor Price + FM Transmitter Total Cost w/DVI/HDMI Monitor: Appx $48 + Monitor Price + FM Transmitter Overall Tech Level: Moderate Overall Tool Requirement Level: Moderate/Low Expert Micro HDMI Cable ~$10-20 Micro HDMI High Speed Male To HDMI Male Cable - 5 Feet For HTC EVO 4G (no idea who these people are) 111458226 This is who I ordered from (mouser). Came pretty quick. There are some other places you can order from... More places will be putting them up, as this standard really just came out. Have not been able to test it yet. A Monitor. Keep Size in mind. Take your monitor out to your Car/Truck ETC and actually put it in place. I'm using a 15" Widescreen that I purchased a long, long time ago... and even this is kinda too big. I did some research online for a small (8-10"), and only found monitors that appeared to be from some backwards vendor or have crappy resolution. If you can find a monitor with Digital (HDMI or DVI) input, this is a plus and conversion is not necessary. Method of Converting Digital (HDMI) to Analog (VGA/RCA) ~$65 DO NOT BUY INTO A HDMI -> VGA OR RCA CABLE. THEY ARE FAKE. Not needed if your monitor has HDMI/DVI input. The method I will be trying is: HDMI -> DVI -> VGA. This appears the be the cheapest method while still getting good results. HDMI -> DVI Converter Amazon.com: Eforcity HDMI-F to DVI-M Video Adaptor with Gold… I have this converter now, and it works well. Tested with HDMI out from my cable box to my 37" Olivia (HDMI IN), good picture. Then used HDMI cable to HDMI->DVI converter into my 19" WS Emachines monitor, and picture quality degraded just a hair (probably more due to monitor) (As well it should because it doesn't do anything but passes signal) DVI -> VGA Converter For only $56.00 each when QTY 50+ purchased - HDFURY - DVI TO VGA(RGB) CONVERTER *BLUE EDITION* (STANDARD EDITION) | HDFury - HDMI(DVI) to RGB Converters along with: For only $2.34 each when QTY 50+ purchased - AC Power Adapter 5.0V/1000mA For HDFury item | Power Adapters I've seen great reviews on this product. I am ordering it tonight, but obviously I wont be able to test it until I get my EVO. Monoprice & Ebay has a good prices on it, going with monoprice though so that if it doesn't work, I can return it. My only possible worry with this is that the output resolution will not work on my monitor. This product is available in HDMI -> VGA, but it runs ~100 bucks, so a $3 hdmi->dvi and this seems like a wiser choice (provided there isn't signal degradation, which there doesn't APPEAR to be.) I will be ordering the power cord for it in case the HDMI does not supply enough voltage (i doubt it will) An in car power system ~$28 Free Shipping I went with: Amazon.com: Cobra CPI 480 400 Watt 12 Volt DC to 120 Volt AC Power… Reputable company direct from amazon.com. This product runs appx 100 watts out of your lighter socket (included) or appx 400 watts if you directly connect to the battery. Note, this does NOT auto shutoff when you turn your car off if you direct connect, so if you forget, you could potentially drain your battery (also will not auto shut off if your lighter socket still supplies voltage after the car is off, but I THINK most cars that do this auto shut off if battery is low.) I ran my 19" WS Monitor off of this with NO Problem (plugged into cig outlet), and when I feel like it, I'll drag my Wii out to my car and try to play Mario Kart (while NOT moving ) Having the 5V USB conn is nice, and the power cord for the HDFury runs off of USB power (get a splitter to run power to your EVO, or get a Cig lighter splitter) Only downside with the USB connection is it is indeed between the 2 plugs, so if you have one of those fat power plugs, it will block the USB supply. An FM Transmitter or 3.5" Aux in w/cable $20-50 or Free If your going to be doing this, you PROBABLY already have one of these. Other than that I can't offer any help. I was able to pick one up for $7 at menards (like home depot) on clearance. Very YMMV. If anyone has opinions, bring 'em up! If you have a 3.5" Aux in for your stereo, your golden!