Umbraco 5 cheat sheet
Display content from Upload property on page
<img src="@Umbraco.GetMediaUrl(DynamicModel.Id,"nameofproperty")" />
Deploy of Umbraco 5 - Folder permissions
To run, the target minimum permission set for Umbraco 5 is Medium Trust or higher, with the following file permissions:
Root of site: Read/List
Debug Logging folder (default path: ~/App_Data/Logs/*) - Read/List/Write
Plugins folder (default path: ~/Plugins/Core/* and ~/Plugins/Packages/* and ~/Plugins/bin*) - Read/List/Write
For deployment it's possible to set read-only access to these folders, but in regular circumstances Umbraco will attempt to shadow-copy assemblies from the subfolders to ~/Plugins/bin on app startup
Stolen from - http://jupiter.umbraco.org/Getting-started-in-the-Jupiter-Codebase.ashx