We had over 1000 downloads direct from our server of our first free issue, and hundreds more from the iBookstore. Our second issue sold around 40 so far at $5 through the iBookstore and Amazon (with direct sales coming soon).

We're gearing up to publish our next issue at the end of July and do a big marketing/PR push around Photoshop World in September. I'm confident our one little server will hold up just fine.

The bulk of the 1000 downloads came over a couple days after we were mentioned in Adobe's Photoshop.com blog. According to Google Analytics we had on the order of 20 simultaneous visitors at times without a hiccup. That's actually a pretty light load for a modern PC server -- I didn't even bother to ssh into our mini to check performance stats. We do have CloudFlare proxying the site, so undoubtedly that helps.