This link mentions use of -Membertype argument to filter the output a little.
get-Process | get-Member -Membertype property
OR
get-Process | get-Member -Membertype method
I have not worked with PowerShell to much yet so I don't know if that is what you are looking for or not.
Shawn Melton
Twitter: @wsmelton
Blog: wsmelton.github.com
Github: wsmelton