I think next big thing would be mobile commerce as we see grow no of users mobile phones than the computers . I can see that from years how internet came along from dial up to Broadband doing business on Internet .Past three years the trend has changed such way that people can work using mobile phone like Email,IM and internet right in our palm using these smartphones. after looking at it stats from past

I feel that mobile commerce will grow tremendously going forward I would buy a recent study shows Ebay Expects to sell $1.5 Billion Dollars worth of goods through Mobile commerce .What I see in this is Mobile commerce would be a next big thing .

It is worth reading this article on TechCrunch.com

http://techcrunch.com/2010/03/30/ebay-expects-to-sell-1-5-billion-worth-of-goods-through-mobile-devices-in-2010/