ftp download all zip files

I am forcing myself to learn powershell and am finding it very challenging compared to vbscript.  I want to connect to a ftp site and off the root download all the zip files.  The code below works for a specific zip file, but I have no idea how to enumerate to get all zip files.  I also don't know how to do error checking or write to a log in powershell.  I though it was so easy.  :)  I have searched the net, but most examples seem over complicated. I would even be happy using wild cards or an array since I know what files to expect.  their names do change some that is why the wildcard would help.
  
 
$File = "D:\test\zipFile.zip"
$ftp = "ftp://UserID:Password@ftp.Site.net/zipFile.zip"
 
"ftp url: $ftp"
 
 
$webclient = New-Object System.Net.WebClient
$uri = New-Object System.Uri($ftp)
 
 
 
"Downloading $File..."
 
$webclient.DownloadFile($uri, $File)

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