Red columns are my mile splits
Green Line is my overall adjusted pace trend (i.e. what direction was my overall pace trending at each mile)
Blue Line is cumulative time
X-axis shows miles
Final Time = 3:36:47
For comparison I charted my 2000 Silicon Valley Marathon data.
Final Time: 3:24:32
Besides the obvious pace difference, I think I ran the 2000 race a bit more evenly, but that makes sense since the course was dead flat whereas Napa was bumpt at the end after downhills in the beginning. At Napa I didn't need to stop at all, but I did walk about 20 seconds through the last 3 water stops, so that affects the pace at the end.
One last chart. This one compares my average pace across three different races, SF 2000 (red)(notice the big drop-off at the end) SVM 2000 (green), and Napa 2009 (blue):