In Unix, people often create a folder, ~/bin and save their own programs and scripts there. They make these programs easily accessible by adding the directory "~/bin" to the end of the $PATH variable in the shell.
I'm sure every other PowerShell user already knows this, and I'm being a total noob, but just in case you know even less than I, here's the howto.
1. Click the start menu, right click on Computer, and select the Properties.
2. In the left column, you'll see Advanced System Settings. Click on that.
3. Click on "Environment Variables".
4. Under the "User Variables..." section, click "New..." and then set the values to "PATH" and "%USERPROFILE%\bin".
5. Click OK. That sets the variable.
6. Start PowerShell. Then type "echo $env:path" to check your work. The full path should have been expanded.
7. Go into your folder (click there via the C:\Users folder) and create a new folder named bin. (You can also do a little cut and paste from the above step to create the directory.)