Slot machines are the most popular casino game in the world, both at land-based and online casinos. There are now over 1,000 online slot machines, including classic 3-reel slots, the newer 5-reel and 7-reel video slots, interactive i-Slots, and progressive jackpots. There are a lot of software providers these machines, including Microgaming, Real Time Gaming, Play Tech, Vegas Technology, and Bo…