okay here we go!
original course notes, including psets, labs, exams
more exercises and info around that site
also looks like there is Feynman's Tips On Physics: A Problem-solving Supplement to The Feynman Lectures on Physics (by feynman and co.)
and michael gottlieb (feynman's co-author) on yahoo answers said, about a year ago:
My colleagues and I are currently working on remedying this situation by creating one big book of about 900-1000 exercises collected from the older exercise books, with answers for all (or most, and worked-out solutions for many) that cover all the main sequence material in FLP. There's an agreement in place (with Basic Books) to publish this new exercise book, but we are still working on the manuscript, which we hope will be done sometime near the end of this year.