I am starting to learn TikZ. I was wondering if the source code for all examples in the TikZ manual (2.10 version) is available somewhere for download?
The source code for the manual is included with your TeX distribution, if you have chosen to install the documentation source. With TeXlive 2011 they're found in
\texmf-dist\doc\generic\pgf\text-en. They can also be found on CTAN.