Large organizations like the World Bank have tool kits for entrepreneurs to help solve problems. The top MBA programs throughout Europe hold various business plan and venture capital competitions. Let's combine them to hold web challenges.
European MBAs are more than happy to host competitions and can serve as a facilitator to get ideas off the ground. Engineers and MBAs form teams early in the year to build a prototype that addresses a challenge (organized by the EU or World Bank, Red Cross, etc) or submit original ideas.
Winners and/or top performers have the option of meeting with incubators or angel investors. As the businesses progress, they can then participate in the existing venture capital and business plan competitions at a later date.
Governing organizations, corporate sponsors, or non-profits submit detailed challenges that could include a description of the opportunity, market data (the World Bank and supporting organizations have tons), resource tool-kits (we've listed tons here), and possibly a mentor (professors would be ideal).