Not the best, but better than nothing...
http://www.cnn.com/ELECTION/2008/primaries/results/scorecard/#val=R (you can click the RNC Unpledged tab or select other graphs from dropdowns)
http://en.wikipedia.org/wiki/Republican_Party_%28United_States%29_presidential_primaries%2C_2008 (Scroll down to breakdown)
Interesting links.
Did you see this in the notes:
“There are currently 2,380 total delegates to the Republican National Convention, including 1,917 pledged delegates and 463 unpledged delegates. The total number of delegate votes needed to win the nomination is 1,191.
• Unpledged delegates in the Republican Party do not have to indicate a candidate preference, but a majority are elected just like pledged delegates. Of the 463 unpledged delegates, 123 are RNC members who become delegates automatically. “