Yup-- MoldFlow Express was dropped in SolidWorks 2008 by MoldFlow.
Note Autodesk bought MoldFlow so that's probably the reason why. It will probably be free with Inventor --now.
There is info about this on the home page of the SW Customer Portal.
Why won't MoldflowXpress be available in SolidWorks 2008 onwards?
Starting with SolidWorks 2008, MoldflowXpress will no longer be available. Moldflow Corporation has decided to not continue their investment in MoldflowXpress. If you require this functionality we recommend you contact Moldflow Corporation about their MPA (Moldflow Plastics Advisor) for SolidWorks. We apologize for any inconvenience that this has caused you.
Moldflow has also been aquired by AutoDesk. AutoDesk has a press release on this dated May 1, 2008.
Definately a bummer for those that used it. Reminds of the time back in 2000-2001 when SolidWorks bought CimLogic (the software that gave SW their Hole Wizard and Toolbox). We couldn't get registration keys anymore to use CimLogic with our AutoCAD installs.