Ideas are the currency of greatness. Find something exciting and share it. Even better, find several things that are exciting; integrate, modify, adapt and extend - then share it.
Here are links to some sites that I find very informative and helpful.
Academic Earth - Video lectures from the world's top scholars
ScienceBlogs - An entry point to a huge number of places to learn of the latest in science and technology.
Library of Congress - The folks in Congress may not understand what it is that we the people want or need but their library is mighty fine. You could probably spend the rest of your life reading here.
Smithsonian Institution - 19 museums, 9 research centers and the National Zoo. Start here and link to any Smithsonian resource.
USA.gov - Government Made Easy - a good place to start looking for information.
DeepBlog.com - Explore the colorful world of blogs.
Really Smart People
If I have seen farther, it is by standing on the shoulders of giants. Sir Isaac Newton
You can decide if these links are to giants. Visiting these links will definitely help you see farther.
MIT Open Courseware - Now, you can stay up all night and do some of the homework sets. If you want to have real fun, pick 4 or 5 courses and do them at the same pace as someone at the Institute.
Sciencentral - Science and technology updates - fresh.
The Grid Cafe - CERN's site that explains the world of grid computing.