I found myself doing searches all the time when writing blog posts (other blogger's and my own) and found this really easy to use Plugin for Live Writer developed by Mike Taulty.
Thankfully he was complaining about Google's about face on its Search API set and he referenced and old post ... great for me! I was thinking about creating this very same plugin but never found time. Mike makes use of the both the Windows Live Writer API and the MSN Search API.
"It is better to know some of the questions than all of the answers." - James Thurber