H1-B visas: McCain says US workers should have the first chance for high-paying tech jobs, but he has also called for an increase in the number of H-1B foreign-worker visas.
Obama questions the need for more H-1B visas, but he's also called for reform of immigration programs, including ways for immigrants to become permanent residents.
R&D tax credit: Both candidates called for a permanent extension of a frequently expiring R&D tax credit for US companies.
Renewable energy: Obama has made renewable energy a campaign centerpiece. He's called for a government investment of US$150 billion over the next decade to encourage development of biofuels, hybrid cars and solar and wind energy. He would double federal science and research funding for clean-energy projects and create a US$10-billion-a-year clean-tech venture capital fund.
McCain has said renewable energy sources are a part of the solution needed for US independence on foreign oil, but he's largely focused on pushing for offshore oil drilling.