Are there any other options to include ColorBrewer palettes in ArcGIS 10?
If you only need color scheme of ColorBrewer, http://arcscripts.esri.com/details.asp?dbid=14403 is a workaround while waiting for new update of ColorTool.
Here is Nice information about it. http://gis-techniques.blogspot.com/2011/03/how-to-get-color-brewer-ramp-in-arcmap.html
National Cancer Institute have not updated the excellent ColorTool for ArcGIS to ArcMap 10 yet:suggest that an email request sent to the ColorTool Technical Support: firstname.lastname@example.org
From a previous comment I made: I emailed the developers (gis.cancer.gov/tools/colortool) and received the response: "The current installer does not fully succeed in ArcMap 10 environments, however you can manually add the "ColorToolPro9_2.0.tlb" from the installation location (usually c:\program files\NCI GIS Tools\colortool) to add the command to a toolbar. " Which I suppose is a satisfactory workaround.
If you're not completely wedded to ArcGIS, QGIS has really nice custom color ramp capabilities for both vector and raster.