Every once in awhile I need to check the property bag on a SPWeb object. I have made a quick PowerShell script to view all the properties on the root web. You can check other webs in the site collection by adding the relative Url to the OpenWeb Method.

Here is the 4 lines of code. 

Add-PSSnapin "Microsoft.SharePoint.Powershell" -ErrorAction SilentlyContinue

$site = spsite "http://server"

$web = $site.OpenWeb()

$web.AllProperties