The IIS team has announced that Windows Server Codename "Longhorn" Server Beta 3 has reached a high level of quality and is ready for your testing. You can test awesome new hosting features in IIS 7 and roll it out for beta hosting.
Find out how to get the bits!
One thing you can do to help save memory usage is to enable the WorkstationGC. The GC, or garbage collector, manages the memory for appDomains.
http://support.microsoft.com/kb/911716