http://www.reddit.com/r/programming/comments/e39xr/the_posting_of_an_open_source_payroll_app_with_a/
I've experienced exactly this on my own blog (see, for example, comments on this post: http://blog.jgc.org/2008/02/tonight-im-going-to-write-myself-aston.html)
Does anyone have insight into who these folks are? Are they students? This seems like an interesting cultural phenomenon. These folks are universally polite, but seem to have little clue. Often asking the most basic questions which seem to indicate that they have little knowledge. Given their low level of knowledge it's striking that they are often trying to download and understand quite complex programs. Many times they seem to not even be able to locate the download link for source code.
In almost all cases it appears that these folks are from India.