Place this in the root of your project directory.
It is a direct clone of VisualStudio.gitignore available in the github/gitignore repository, with some Umbraco-specific ignores.
# Umbraco stuff
# Data folders/files
*/ExamineIndexes/*
www/App_Data/umbraco.config
*/App_Browsers/*
*/App_Data/TEMP/*
*/_systemUmbracoIndexDontDelete/*
*/App_Data/Logs/*
# ImageGen
*/Cached/*
# Misc crud
*.orig
Contributions/pull requests to this .gitignore are welcome.