Any how to books to improve programmin skills?

[cs23]

I have basic understanding of programming, but i would like to improve. Are there any websites/books that have problems and solutions?

[Edgardo]

Ben Dowling wrote two articles with a collection of excellent puzzle websites:
10 programming puzzle websites (http://sixrevisions.com/resources/10-puzzle-websites-to-sharpen-your-programming-skills/)
10 More Puzzle Websites to Sharpen Your Programming Skills (http://www.coderholic.com/10-more-puzzle-websites-to-sharpen-your-programming-skills/)

Here is another puzzle website with solutions: http://www.open-cs.net/

[jtbell]

Do you have a particular programming language in mind?

[chiro]

Hey cs23.

Look at large complex projects that are mature (have been in development for some significant time). This is a great way to learn quickly.