I would agree with also checking with the employer. Any time you want to utilize open source in a project you should see what the employers policies are on thi

I would agree with also checking with the employer. Any time you want to utilize open source in a project you should see what the employers policies are on this. You will also need to be careful about contributions back to your open source stuff. This is one of the areas that open source foundations have done really well. The dojo and Apache foundations as an example have you fill out a contributors agreement to ensure the IP of any code that is submitted to them is "clean".