Using the powershell command: Get-SPWebTemplate you can get a list of templates with their ID's.

Here is the list from a standard SharePoint 2010 environment.

Name	Title
----	-----
GLOBAL#0	Global template
STS#0	Team Site
STS#1	Blank Site
STS#2	Document Workspace
MPS#0	Basic Meeting Workspace
MPS#1	Blank Meeting Workspace
MPS#2	Decision Meeting Workspace
MPS#3	Social Meeting Workspace
MPS#4	Multipage Meeting Workspace
CENTRALADMIN#0	Central Admin Site
WIKI#0	Wiki Site
BLOG#0	Blog
SGS#0	Group Work Site
TENANTADMIN#0	Tenant Admin Site
ACCSRV#0	Access Services Site
ACCSRV#1	Assets Web Database
ACCSRV#3	Charitable Contributions Web Database
ACCSRV#4	Contacts Web Database
ACCSRV#6	Issues Web Database
ACCSRV#5	Projects Web Database
BDR#0	Document Center
OFFILE#0	(obsolete) Records Center
OFFILE#1	Records Center
OSRV#0	Shared Services Administration Site
PPSMASite#0	PerformancePoint
BICenterSite#0	Business Intelligence Center
SPS#0	SharePoint Portal Server Site
SPSPERS#0	SharePoint Portal Server Personal Space
SPSMSITE#0	Personalization Site
SPSTOC#0	Contents area Template
SPSTOPIC#0	Topic area template
SPSNEWS#0	News Site
CMSPUBLISHING#0	Publishing Site
BLANKINTERNET#0	Publishing Site
BLANKINTERNET#1	Press Releases Site
BLANKINTERNET#2	Publishing Site with Workflow
SPSNHOME#0	News Site
SPSSITES#0	Site Directory
SPSCOMMU#0	Community area template
SPSREPORTCENTER#0	Report Center
SPSPORTAL#0	Collaboration Portal
SRCHCEN#0	Enterprise Search Center
PROFILES#0	Profiles
BLANKINTERNETCONTAINER#0	Publishing Portal
SPSMSITEHOST#0	My Site Host
ENTERWIKI#0	Enterprise Wiki
SRCHCENTERLITE#0	Basic Search Center
SRCHCENTERLITE#1	Basic Search Center
SRCHCENTERFAST#0	FAST Search Center
visprus#0	Visio Process Repository

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