Any founders with English as a second language?

Really depends where you live and your resources. The best solution is to attend an adult english course. The side-benefit is you meet others in a similar situation to yourself.

Other alternatives are to find a fluent English speaking/writing co-founder or to pay for professional editing / copywriting /PR services. Of course, these alternatives presume that you have above average technical skills in your domain of expertise.

Over the long-term you probably would benefit the most from the first suggestion. Your success in an English speaking country takes a big hit if you are not able to fluently communicate with others in a variety of situations. Of course, if you are targeting a specific multi-cultural demographic, then such concerns are greatly diminished.