Find the SharePoint web Template ID

The web template id can be found using object model or Power shell script.
Powershell script to find the specific web template details:
Open windows Powershell ISE to execute the comments/scripts. Load the SharePoint assembly if those are not loaded.
To load the SharePoint assembly
[System.Reflection.Assembly]::Load("Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c")
OR
This assembly can be referred using the “LoadWithPartialName” function which doesn’t require the full assembly information:
[System.Reflection.Assembly]::LoadWithPartialName(“Microsoft.SharePoint”)

$web = Get-SPWeb http://portal
write-host "Web Template:" $web.WebTemplate " Web Template ID:" $web.WebTemplateId
$web.Dispose()
Above script can be stored as a .ps1 file and can be executed using SharePoint PowerShell window.

C# code to find out the web template details:
Server Object model can be used for finding out the web template details.
using System;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
try
{
using(SPSite site=new SPSite(@"http://sitecoll/"))
{
SPWeb web = site.RootWeb;
Console.WriteLine("Web Name : "+web.Title);
Console.WriteLine("Web Template Name : " + web.WebTemplate);
Console.WriteLine("Web Template ID : " + web.WebTemplateId);
Console.WriteLine("Web GUID : " + web.ID);
}
Console.Read();
}
catch (Exception ex)
{
Console.WriteLine("Error: "+ex.Message);
}
}
}
}