[squarefoot]

It's not immoral at all, but I agree it is very dangerous. My job at the companies benefited immensely from what I learned when working on my personal projects, and naturally the other way around. But of course I never brought my code at the company (although I had in a couple occasions done the opposite in emergency situations with the company knowing, a few days I never billed them for but contributed to a good raise afterwards - dear old times when handshakes were often enough). Bringing your code at the company today is very very dangerous, and i mean just bringing it in, not working on it during company time on company's hardware. Don't do that.