MVC is open source as it Entity Framework. I don't think proprietary is necessarily bad. It depends on your customer base and the solutions they're willing to accept.

Addtionally, there are many tech conferences on Open Source. I'm speaking at one next month. (for those lurking, you may want to read that again.) There is a jQuery conference in Portland, Oregon this summer. A Ruby on Rails conference here in Salt Lake City this month and a JavaScript conference next month. Our recent Code Camp here was mostly geared to web and open source. I spoke this past weekend at Code Camp in Phoenix, Arizona. My entire presentation was on Open Source tools.


>IMO the real choice is whether to:
>(1) continue developing for the Windows desktop
>or
>(2) skip directly to web development.
>
>(2) offers you several alternatives:
>a- open source solutions / loosely typed languages such as ruby on rails or php/zend
>b- proprietary solutions such as asp.net
>c- keep your existing VFP apps and adapt them to the web with foxincloud
>
>here are IMO the profile for each of these 3 alternatives:
>a - you prefer freedom, community input, lots of learning / interacting on the forums
>b - you seek a label you can sell to large companies, and you like 'learning' from tech conferences / shows
>c - you prefer to learn gradually about the web (HTML/CSS/JS/HTTP) and deliver quickly real web-based applications to your clients, IOW enter the web world gradually.