The Marathon will have live results including split times somewhere on the 
Baltimore Marathon Site or at 
Active.com. I don't know for sure and I won't be checking from the course.
For all of you that follow me on twitter, you are obviously waiting for updates with baited breath, I haven't had the time to work out a way to update that I am sure won't end up as spam.
Instamapper is showing you the last time I had GPS Tracker running, when I ran 20 miles of the course in baltimore, but will update as soon as I start it back up on Saturday.
Non-Embedded: 
http://www.instamapper.com/ext?key=7514930745553215930
Mobile Tracking: 
http://mobile.instamapper.com/ext?key=7514930745553215930
GPS tracking powered by 
InstaMapper.com (Reload page for updates)
I will be wearing bib number Shawn (1117), my sisters Emily (21796) and Karina (31683) will both be running the Baltimore Half Marathon. I also run with a 
Garmin 305, after the race I will have detailed track information which I view with 
Ascent from Montebello Software. Ascent allows me to view my pace, heart rate and supporting data with a replay function to view recorded data with a map overlay.
After the race I will upload the recorded course to mapmyrun.com