[obarthelemy]

I used to be involved in hiring for a consultancy. We didn't care for previous employers as long as they were legal, we cared about projects, technologies, challenges... Then again we were open-minded, we did work for a quasi-pornsite and a very official gambling site.

My guess would be that some companies will object, but very few. Probably the same for which your religion, marital status, sexual orientation... will matter, so maybe not very desirable employers ?