So you want an easy upgrade patch for version 4.11.x to version 6.0.0 (I just tested it from 4.11.1, but it should be ok also for 4.11, 4.11.2.x and 4.11.3.x)? You can follow the umbraco guide, download the new zip and overwrite the bin, umbraco, umbraco_client folders and merge the config files as explained, or prepare your own patch, or you can also use my patch here: umbraco-upgrade-4.11.0-to-6.0.0.zip

Please be careful: merge the config files and web.config with a tool like Winmerge. I use a commercial tool: Beyond Compare 3, which is one of my favorite programs and I can only recommend it, it costs only 30 USD. If you deploy many patches or you need a really good comparison tool, this is the one to use.

Check also: Official Umbraco 6.0.0 release on codeplex

Enjoy.

Update 6.6.2013: If you want to get the newsest patches, check also my new post: Umbraco upgrade patches for umbraco 6.0.0 to 6.1.1