Swords & Wizardry Complete has been free in PDF since November 5th of last year. I should know as the blessed event happened on my 2nd wedding anniversary. It was probably the best gift +Matt Finch and +Bill Webb could have given me, as we've played the shit out of S&W Complete.
Oven the last year I've either emailed a copy or folks have downloaded over 3,500 copies of S&W Complete in PDF.
The vast majority of those using the link on the right side of this page.
I don't think a day has gone by that a copy or three (or more) hasn't been downloaded.
I'm far from the only source one can grab a copy from, but I am thrilled to have been able to share an excellent rule system with so many gamers over the last year.