$capture

$capture.Url(Post post) - string - Returns the URL to capture a forum thread to a wiki.

$globals

$globals.FullPath(string relativeUrl) - string - Returns the full path version of the relative url.
$globals.FormatDateTime(DateTime time) - string - Returns a string formated to the Utility_CurrentTime_dateFormat (in Resources.xml)

$helpers

$helpers.FormatFrom(string name, string address) - string - Returns a string in the form of '"name" <address>'.
$helpers.FormatFromAutomated() - string - Returns a string in form of '"$settings.SiteName - Automated Email" <$settings.NotificationFromEmailAddress>'.
$helpers.HtmlEncode(string text) - string - Returns the html encoded text.
$helpers.HtmlDecode(string text) - string - Returns the html decoded text.

$mg

$mg.FormatSubject(Post post) - string - Removes "re: " from the post subject and adds prefixes the list name to the post subject.
$mg.GetUserAddress(User user) - string - Gets the email address for the user.
$mg.RenderHtml(Post post) - string - Returns the post with html formatting.
$mg.RenderText(Post post) - string - Returns the post without html formatting.
$mg.IncludePreviousPosts(Post post) - bool - Returns true if the post was received via email.
$mg.MessageID(Post post) - string - Returns "<PostID-UserID@HostUri>"
$mg.ParentID(Post post) - string - Returns "<ParentID-UserID@HostUri>"

$resources

$resources.GetString(string resourceName) - string - The matching string from the resource file.

$settings

$settings.SiteName - string - The name of the site
$settings.SiteUrl - string - The URL of the home page of the site

$spam

$spam.GetSubject(Post post) - string - The likelihood of the blog post as spam.

$term

$term.Get(string term) - string - The value of the site term passed in.

$urls

$urls.AcceptFriendship(string requesteeUserName, string requestorUserName) - string - The url to accept the friendship request.
$urls.AcceptUserInvitation(User Invitation invitation) - string - The url to accept the invitation to join the community.
$urls.LoginClean - string - The url of the login page for the site (Clean because it has no return url).
$urls.Home - string - The url of the home page of the site.
$urls.Moderate - string - The url of the forum moderation control panel page.
$urls.RejectFriendship(string requesteeUserName, string requestorUserName) - string - The url to reject the friendship request.
$urls.UserChangePassword - string - The url of the change password page.
$urls.UserFriends(string userName) - string - The url of the user's friend list.
$urls.UserEditProfile - string - The url of the edit profile page.
$urls.UserProfile(User user) - string - The URL of the user's profile page.

$viewable

$viewable.Uri(IViewableContent content) - Uri - The Uri to the content.
$viewable.Uri(Conversation conversation) - Uri - The Uri to the conversation thread page.
$viewable.Uri(Message message) - Uri - The Uri to a page displaying this message thread.