A collection of proof of concepts I've made over time and find usefull to refer back to.

Enum_POC: Enum bitwise operations
ThreadingTimerPOC: Experiments with singletons and System.Threading.Timer
WindowsForms/WPF MessageBoxIcons: Samples of all the message box icons
xUnit Practice: Some xUnit samples
Silverlight RX: Using reactive extentions in silverlight to merge events
FSharp_WinService: Simple F# Windows Service
MetroUnitTestPOC: Testing out the new unit test class for Metro projects.
RavenDBEmbeddedPOC: Using embedded Raven db in a .Net 4.5 project.
RavenDB_Metro_POC: Attempted using Raven in a Metro app (didn't work!).
Fluent NH Tutorial: Simple console app using Fluent NH
Silverlight_Wait: Using ManualReset.WaitOne to control threads
SilverlightOdataFSharpPOC: Attempt to use async workflows in F# in Silverlight for Odata access.
CustomConfigPOC: Sample multi and single element custom config sections
Ruby_GoogleMaps_Stuff: Calculate a route based on given distance criteria and local points of interest
CouchDB: Read a file for ID's, get some docs, and do some things