First Sale on the new marketing technique!

In trying to promote sales for my book series I've offered the first book in the series as a TOTALLY FREE DOWNLOAD for a limited time only. I hoped if they liked the first book they'd be willing to buy the next one. Well i got 6 more download reviews and my first sale within 8 hours of doing it this way. Now I know one sale really doesn't mean anything but I see it as a positive start to say the least. At the same time I'm blogging to everyone everywhere about it being a free download to promote interest. If you're interested in grabbing a copy you can get it at: Smashwords / Free E-Book . If you want to blog it on your blog feel free to do so, I'd greatly appreciate any and all help I can get. I'd also like your input on this type of marketing strategy. Please feel free to comment as you see fit. Honesty is by far the best road to improvement!