When I saw the handiwork of the two intrepid DIY'ers featured in this post on Nexus 7 car mount projects, I'll admit - I was impressed, if only for their quality execution.
Cars have always been an interest of mine, and the current "infotainment center" paradigm many automakers are pushing onto customers really does suck in a lot of ways. Pay $1500 for a crappy nav system that's hard to use, complicated, and woefully outdated in a couple years' time. Sounds great! But even the best systems (a title I think VW and its subsidiaries currently hold) are lacking. Nav maps are ugly, hard to read, and rarely up to date.