I installed Vista RC1 / 5600 edition and have been experimenting with the Microsoft.Web.Administration namespace.  These are examples I got working on my local machine running Vista Ultimate Edition.  Hope these help.  If you find a more efficient way, by all means pass them along!  These are my first attempt to understand and learn the new Microsoft.Web.Administration Namespace. 

'Create a new site called SteveSchofield.net
Dim
objSite As New Microsoft.Web.Administration.ServerManager
objSite.Sites.Add(
"SteveSchofield.net", "c:\domains\steveschofield.net", 80)
objSite.Sites(
"SteveSchofield.net").ServerAutoStart = True
objSite.CommitChanges()

'Add an ManagedPipelineMode.Integrated application pool
Dim objAppPool As New Microsoft.Web.Administration.ServerManager
objAppPool.ApplicationPools.Add(
"SteveSchofield.net")
objAppPool.ApplicationPools(
"SteveSchofield.net").ManagedPipelineMode = ManagedPipelineMode.Integrated
objAppPool.ApplicationPools(
"SteveSchofield.net").AutoStart = True
objAppPool.CommitChanges()

'Add an ManagedPipelineMode.Classic application pool
Dim objAppPool As New Microsoft.Web.Administration.ServerManager
objAppPool.ApplicationPools.Add(
"SteveSchofield.net")
objAppPool.ApplicationPools(
"SteveSchofield.net").ManagedPipelineMode = ManagedPipelineMode.Classic
objAppPool.ApplicationPools(
"SteveSchofield.net").AutoStart = True
objAppPool.CommitChanges()

'Create a Site, Application Pool (ManagedPipelineMode.Integrated) and add new site to the new App pool that was just created.
Dim objSite As New Microsoft.Web.Administration.ServerManager
objSite.Sites.Add(
"SteveSchofield.net", "c:\domains\steveschofield.net", 80)
objSite.ApplicationPools.Add(
"SteveSchofield.net").ManagedPipelineMode = ManagedPipelineMode.Integrated
objSite.Sites(
"SteveSchofield.net").Applications("/").ApplicationPoolName = "SteveSchofield.net"
objSite.CommitChanges()

'Create a Site, Application Pool (ManagedPipelineMode.Classic) and add new site to the new App pool that was just created.
Dim objSite As New Microsoft.Web.Administration.ServerManager
objSite.Sites.Add(
"SteveSchofield.net", "c:\domains\steveschofield.net", 80)
objSite.ApplicationPools.Add(
"SteveSchofield.net").ManagedPipelineMode = ManagedPipelineMode.Classic
objSite.Sites(
"SteveSchofield.net").Applications("/").ApplicationPoolName = "SteveSchofield.net"
objSite.CommitChanges()

'List application pools using IIS7 namespace
Dim
Server As New Microsoft.Web.Administration.ServerManager
Dim col As ApplicationPoolCollection
Dim AppPoolName as string
Dim x as integer

col = Server.ApplicationPools

For
x = 0 To col.Count - 1
     AppPoolName = col(x).Name
Next

'List sites using IIS7 namespace

Dim
Server As New Microsoft.Web.Administration.ServerManager
Dim col As SiteCollection
Dim SiteName as string
Dim x as integer

col = Server.Sites

For x = 0 To col.Count - 1
     SiteName = col(x).Name
Next

'List all worker processes using IIS7 namespace. (Note this is just an example, there are other properties that can retrieve information about worker processes). 
Dim Server As New Microsoft.Web.Administration.ServerManager
Dim col As Microsoft.Web.Administration.WorkerProcessCollection
col = Server.WorkerProcesses

dim x as integer

For x = 0 To col.Count - 1
         Response.Write(col.Item(x).ApplicationDomains(x).Id &
"<BR>")
         Response.Write(col.Item(x).ApplicationDomains(x).Idle &
"<BR>")
         Response.Write(col.Item(x).ApplicationDomains(x).PhysicalPath &
"<BR>")
         Response.Write(col.Item(x).ApplicationDomains(x).VirtualPath &
"<BR>")
         Response.Write(col.Item(x).ApplicationDomains(x).WorkerProcess.ProcessGuid &
"<BR>")
Next


'Recycle Application Pool
Dim RecycleSite As New ServerManager
RecycleSite.ApplicationPools(
"SteveSchofield.net").Recycle()

'WebPages to help test if recycle actually worked.

'Test out the process

'Default.aspx to show session variable
<html>
 <body>
 <% If Request.Querystring("ID") = "Show" Then %>
  <% Session("Steve") = System.DateTime.Now() %>
 <% End If %>
 
 <% response.write(Session("Steve")) %>
 </body>
</html>

'Recycle.aspx webpage

<html xmlns="http://www.w3.org/1999/xhtml" >
<
head runat="server">
   <title>Untitled Page</title>
</
head>
  <
body>
   <form id="form1" runat="server">
      <div>
          Click Button to recycle<br /><br />
        
<asp:Button ID="Button2" runat="server" Text="Button" />&nbsp;</div>
    </form>
  </
body>
</
html>

'Recycle.aspx.vb code behind file
Imports Microsoft.Web.Administration
Partial Class _Default

System.Web.UI.Page
   Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
      Dim RecycleSite As New ServerManager
      RecycleSite.ApplicationPools(
"SteveSchofield.net").Recycle()
   End Sub
End
Class