I read this article and was interested to see that in the first six months of 2010 more game units were shipped digitally than via retail (although retail still accounts for the most revenue). That’s a pretty cool turning point for the industry. Naturally Steam was the biggest vendor of digital games, and who was the biggest Casual game provider? Why Big Fish Games of course!
Clearly if you an an Indie making arcade games you’ve got to target Steam and Direct2Drive (as well as selling direct of course). And if you are making casual games, that top 5 list should be a good starting point (Gamehouse is Real Arcade by the way).