Articles: Intellisense for Expression Blend 2 SP1 working again! (mention details about installation steps)
Code Reference: IntelliSense For Expression Blend
Installing BlendSense in XP is as easy as what the article instructs. Under Vista OS, I have to use cmd console to execute following command:
# cd [Blend Installation Folder]
# Blend.exe -addin:Addins\Expression.Blend.Intellisense.dll