Another successful startup using Seaside and Smalltalk: auctomatic.com. Its a tool to ease selling at eBay. They now have been bought by Live Current Media.
Have a look at the interview with Meet Harjeet, one of the co-founders behind Auctomatic. He talks about the ideas and also about Smalltalk and Seaside.
Read more about the deal here and here.
So if you want to become a millionaire with a web startup too start coding in Smalltalk and Seaside...