Does anyone out there know of xc skiing timing software that supports running split times? I traditionally run SplitSecond, but it does not run split times for xc races.

Look at this software.
Maybe it can, it's for xc sking.

http://skiscoring.com/TimerCommunication.htm

When do you need it? Split Second used to have this feature and may have it in the near future.

How are you timing the slits? Remotely? Directly connected to the computer? There are a number of solutions I have used that are very similar to what you are trying to do to time many triathlons.
Jenna

Tom Kendall's Bart software will time running splits using Summit Systems SRT1000 wireless timers. You can drive a Daktronics display and post to any website.

You can contact Tom at
http://www.bart.chipco.com/

I am not sure if you found a solution for your problem, but we have software that is custom and not commercially available and can provide this service for you. There may be commercially available software soon.
Seen me an e-mail at jenna@allsportsevents.com if you need services for next winner with laps times.
Jenna