Mech Powered Cellphone

Might not be much demand for this, but how about putting in a wheel, a bit of which sticks out of of your cellphone that people can turn by rubbing the phone on the carpet, furniture, etc to charge the phone? That way you'll always have some power available if you're stuck somewhere.

More Money for Marshall Brain

A lot more - sell page access - at about 50c a month - pages without ads. Millions buy - more money for him.

Autopatentwriting

Have you looked at a circuit patent? How about some software that takes a circuit and dumps what we're paying attorneys to write? Component 102 is a blah-blah that connects to blah-blah. The blah-blah of blah-blah also connects to the blah-blah of 103. Etc. Could be money in this.

Do a Real Life 10 Day MBA

Get a real life 10 day MBA (contacts) without leaving your job. Get
admitted to a school - take 3 weeks vacation from your job. Go to
class, meet as many people as you can - start emailing profs and
students and build up an email relationship. Then, tell the school
you're not satisfied and get a full refund and return to your job.

Active Noise Canceler

No, not headphones. How do you cancel out a hammer drill? Take a noise source, you could put sensors around it - in 3 dimensional symmetry and sense the noise. Then, further downstream, put audio sources that will generate an out-of phase version of the noise so as to cancel it and make it not audible outside the sphere of the cancelers. But, noise contains energy and, if you don't hear the noise outside of the sphere - it means that the cancelers absorbed the noise - so where did the energy go? The transducers you're using to generate the out-of-phase noise are somehow absorbing energy. How does that work?

TI-RFID and the End of the Hit and Run Era

Because, if another vehicle is within a 1 metre of yours, both vehicles register the information of the other through RFID - once the tags are installed. Won't happen overnight, but this should be done - will be very useful in countriels like India where the traffic is really chaotic.

One Newspaper Crossword Puzzle, Many Readers

How about transparent post-it notes that you can stick on the crossword puzzle and write on - to make your attempt at the puzzle before giving it to someone else. You don't want to spoil someone else's fun. This could be a billion dollar idea - think of how many old people there are. 2/3 of all the people in the history of the world who have lived past 65 are alive today.