Agree with you, the city is turning around. There's a spirit that wasn't there eighteen months ago. There's a vibrant and growing tech community. If you're not there its easy to miss it with the constant bombardment by the national media of what's called locally 'ruin porn'.
A group of us is having a civic hackathon this fall at the M@dison Oct 4-5 to celebrate the state's release of open API's for five themes: jobs, tourism, safety, veterans and foster kids.
If you want to see the real Detroit please join us:
http://www.codemichigan.com