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A good gitignore can be:

<pre style="background-image: URL(http://2.bp.blogspot.com/_z5ltvMQPaa8/SjJXr_U2YBI/AAAAAAAAAAM/46OqEP32CJ8/s320/codebg.gif); background: #f0f0f0; border: 1px dashed #CCCCCC; color: black; font-family: arial; font-size: 12px; height: auto; line-height: 20px; overflow: auto; padding: 0px; text-align: left; width: 99%;"> #Folders
/Library
/Temp
/Builds

#Project/User Preference Files
*.sln
*.csproj
*.pidb
*.userprefs
*.user
*.suo

#OS Junk
Thumbs.db
.DS_Store*
ehthumbs.db
Icon7
</pre>
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