I guess this happened earlier, but I thought I would pass it on. Down load here.
Here what it does from the read me.
Improves performance when modifying customer visibility settings for linked files, when many volumes
exist that are bound by the linked file.
Improves stability when exporting complex views to AutoCAD DWG format, when the hidden lines in
those views have a large gap width.
United Kingdom content is now included in the English installer.
Improves stability when editing a family in the System Editor.
Improves stability when upgrading previous release files that contain certain schedule configurations.
IES light fixture information exported to the IES
Improves performance when opening views with multiple unconnected systems.
1 and 2 pole panels can now be assigned to 3 Phase Distribution Systems.
Wires in a view no longer impact the display of color fills.
Wires are no longer trimmed according to the extents of the light source geometry.
Light fixture preview images do not include the light source geometry.
Improves the plotting consistency of certain components that are placed over hatched elements in
coordination and architectural discipline views.
Improves consistency of panel schedule column sizes when panel name is changed.
Duct and pipe accessories can now change types without disconnecting from duct and pipe segments.
Rooms will now export Revit internal parameters for IFC.
When rendering, the progress bar reports correct percent complete.
“Intensity” on Decal Types dialog was changed to “Brightness” to match Help documentation.
Spot elevation with Display Elevation = Top & Bottom Elevation will now report the correct bottom
elevation for sloped elements.
In plan view with medium or fine detail level, spot elevations now report the correct top or bottom
elevation of a beam that is joined to a column.
Improves stability when changing the visibility of a link in a view template.
“Downlight – Spot” light family no longer has duplicate Tilt Angle parameter.
Lights that were in a light group that was deleted are no longer controlled by the deleted light group;
instead they are controlled by the Ungrouped Lights status.
Improves the ability to enter custom DPI value in the Render dialog.
Improves stability when exporting to CAD formats.
Improves stability when closing SteeringWheels.
Improves stability when adding elements to a group.
Families that contain arrayed voids will now function properly in the project.
Improves stability for users with non-English operating systems when using the Open/Save dialog.
Notes created in Revit for a DWF markup object will now propagate to the DWF after selecting publish.
Enabling daylight portals will now affect the rendered appearance.
Spotting on interior renderings with many internal light sources no longer occurs.
Improves appearance of decals using cut-outs.
Corrects “Unable to Start” error when starting the application.
Model lines now remain in the correct design option when split.
For sweeps on an arc wall, you now have the option to change sweep returns.
Revit® MEP 2009 Web Update Enhancement List
Improves the fidelity of printing and exporting of hidden lines shown in structural and MEP views.