Another problem area for passive revenue stream creators is knowing when something you have created should be a free item or a paid item.
The truth is, there is no really great solution to this problem. The best advice for gauging whether something should be paid or free is to just go with your gut reaction.
If the product took you less than an hour to complete, it's more than likely a good freebie / giveaway. If the product took more time and was way more involved, it's likely a candidate for the paid product section of your website.