It would cost too much in start up capitol. Keep your eyes peeled on Technology related sites... Wired, etc. See what"s hot and what might be coming in the near future... try to build something based on those ideas.
I can write software for your car, i have experience with that ( honest ). Lets face it, all good ideas are taken, those left will take a lot of capital to get started and probably google already works on it Best way is to get adopted by a millionare, especially one with some terminal illness. any suggestions? There were rumors about an operating system which boots via net, and all applications are like widgets. and everything is free ( add suported / like google ). this concept was quite popular a few years back, now its all died down.. wonder why..
You need to just get started creating websites and learning the ropes. You could be looking for your $1 million idea for a lifetime. Get started and start learning how to make money online by making your own sites - that in itself will start you on the right tracks as it will give you real things to measure (i.e how many visitors = $$xx) and more real targets to set yourself. The people who made millions (milliondollarhomepage included) were always actively working on something, and their success is rarely a first attempt. They just kept plugging away.