There are two versions of IIS FTP you can install on Windows 2008 Server:
IIS FTP 6.0
IIS FTP 7.5
IIS FTP 6.0 looks and feels just like IIS FTP running on IIS 6.0. This is useful for legacy applications that still rely on ADSI code to create FTP sites the 'old way'. You can install this by adding the FTP Publishing Service in the Server Roles wizard.
IIS FTP 7.5 is a ground up re-write of FTP for Windows 2008. It's not currently included as a Role Service or Feature out of the box on Windows 2008 but can be downloaded separately from:
IIS FTP 7.5 supports now supports many good things such as FTP over SSL and Virtual FTP Hostnames.