'custom parameters to send back to the page
Dim params As String = "&date=" & _date & "&loc=" & _loc & "&mode=print&"
imgPrinter.OnClientClick = "window.open('" & NavigateURL(TabId, "view", "mid=" & ModuleId.ToString, params & "&SkinSrc=" & QueryStringEncode("[G]" & Skins.SkinInfo.RootSkin & "/" & glbHostSkinFolder & "/" & "No Skin"), "ContainerSrc=" & QueryStringEncode("[G]" & Skins.SkinInfo.RootContainer & "/" & glbHostSkinFolder & "/" & "No Container"), "dnnprintmode=true") & "');"

After reading some posts on the subject, I came up with this really simple solution for adding a print page link to a skin:

<a class="printlink" target="window2" href="/default.aspx?tabid=<%= PortalSettings.ActiveTab.TabID %>&SkinSrc=[G]Skins\MySkin\PrinterFriendly&ContainerSrc=[G]Containers\MyContainer\PrinterFriendly">Print this page >
&nbsp;&nbsp<img id="" border="0" align="middle" src="<%= SkinPath %>printer_small.gif" alt="Print this page" title="Print this page" /></a>

It's pretty much self explanatory. You get the current TabID from <%= PortalSettings.ActiveTab.TabID %> and use this to form a URL that includes SkinSrc and ContainerSrc parameters. Point these parameters to your print friendly skin and container files (less the .ascx extension). Include a printer icon in the hyperlink if you so desire. Use [G] for a host skin and [L] for a site level skin.

Easy.