Okie here goes my first one:
1. General Knowledge on the move
Wikipedia is a free source of knowledge but this knowledge base is restricted to web. What if there be a tool which summarizes those articles (possibly divding it into multiple pieces and shorten it) and makes it available over mobile phones. For instance you want to look up "Lake saimaa" (It is the largest lake in finland and is very beautiful), it picks up the relevant article from wiki and sends back the user a sumamry.
In this case since the article size itself is small (character count 1025) so summarizing it (making it 320 character long) won't be a big issue as such. Some of the popular "sms" shortcut transforms can be used. But what if somebody searches for say "India". Then the summarizing code has to be more intelligent to take the article and ascertain which are the important parts of this particular article (in this case geography, political system, economics, population, military, culture etc). Then it should return say about 200 character long article on India and list it's population, GDP, Average expectancy of life etc and say "make more relevant search by saying ex. India GDP" etc.
This way people are intrigued to send more smses to search server for more content which would in turn result in more revenue.
Now what if somebody sends a query about some recent happening or some obscure topic which wikipedia has no knowledge about. Then we land in a soup. Wikipedia alone cannot cater to all the knowledge "needs". We will need more content, news, articles and such.
Okay then so much for mobile content.