Here are some very good and interesting books and websites which I can recommend for you:
Books
- Presentation Zen, 2nd edition (english, 2011) by Garr Reynolds
- Clean Code (english, 2008) by Robert C. Martin
- Der Weg zum Java-Profi (german, 2012) by Michael Inden
- Soft Skills für Young Professionals (german, 2006) by Andre Moritz, Felix Rimbach
- The 7 Habits of Highly Effective People (english, 1989) by Stephen R. Covey
Websites
- TED Talks (in my opinion the ultimate source for great talks)
Blogs
- Martin Fowler (english)
- CodingHorror (english)
- CodeCentric (german + english)
- JaxEnter (german)
There are far more good books and websites available and if you can recommend one, just let me know.