The US Biographies Project is an all-volunteer, non-profit online resource. State coordinators manage and upload biographies that have been transcribed & submitted by users. Usually the biographies come from an original published source. Several years ago I helped transcribe a number of biographies for the California Biography Project.
The website was started in 1997 by Jeff Murphy as the Kentucky Biography Project and expanded from there to all 50 states. I believe the website may have affiliated with US Genweb at one time, but seems to be an entirely independent entity, these days.
A quick perusal as of this morning shows some of the state links are down, and several states in need of coordinators. The Indiana Bio Project (Deb Murray, coordinator) has the most bios online--over 20,000. I have used the Indiana page several times.
Have a great day!