here is my perfect car charging solution...
i bought the "Griffin PowerJolt Dual Universal" from ebay for $12.88 free shipping.
here is the OFFICIAL link to the Griffin PowerJolt Dual Universal.. Griffin Technology: PowerJolt Dual Universal -
here is the EBAY link to the Griffin PowerJolt Dual Universal.. Griffin PowerJolt Dual Universal 2 USB iPhone 3G 3GS - eBay (item 250532403165 end time Feb-15-10 11:35:46 PST)
then you can either use the usb wire that came with your phone or in my case i wanted a shorter one.. so i bought a 1.5ft wire from monoprice.com for $1
the name of the wire on monoprice is: USB 2.0 A Male to Micro 5pin Male 28/24AWG Cable w/ Ferrite Core - (Gold Plated)
here is a link to the wire (in all sizes) you need on monoprice... HDMI Cable, Home Theater Accessories, HDMI Products, Cables, Adapters, Video/Audio Switch, Networking, USB, Firewire, Printer Toner, and more!
and a cool thing about monoprice.com is that you can pay for items with your paypal acct.. so you dont have to be nervous about entering credit card info.