Symfony 2.0.10 has just been released:
Twig has been updated to 1.6.0 (which fixes a bug when using Assetic in the production environment);
Doctrine has been updated to their latest minor versions;
And as always, some minor bugs has been fixed.
If you are starting a new project, you can get the Symfony Standard Edition distribution on the download page.
Then, run the vendors script (it also clears your cache):
$ ./bin/vendors install
Remember that the Symfony2 Components are also available as standalone
libraries. You can get them via their dedicated read-only repositories on
https://github.com/symfony/Finder for instance), install them via
pear install symfony2/Finder), or even
install them via Composer.