[Update]: You can find the addin for Expression Blend 2.0 SP1 here.
Expression Blend has been out in the wild for quite some time. However one of the most annoying thing was the lack of autocompletion (aka IntelliSense). Most of devs/designers out there were constantly switching from Blend to VS and backwards to do their stuff. The great free tool Kaxaml is at great help as well.
Using the Blend 2.5 add-ins architecture I have created an add-in that adds IntelliSense in Blend. I have reused the code from Kaxaml and adapted it work within Blend. Take a look:
You can download the add-in from here. What you need to do is:
There are some limitation of the current implementation: